Good Day To All.
I am working in a Retail shop, and the Items that I sell are sold by Piece or Box or any other type of UOM.
Every UOM type of the same Item has a different Barcode.
Is there a way for an Item to have multiple Barcodes, and each of those Barcodes represents its own UOM type and Price Rate?
It will make the POS a lot easier.
Thank You
It will also be nice if each UOM could have a specific price and not just a multiple of the base price. In most situation the bulk price is cheaper per item than the unit price
@olamide_shodunke, @Mhmd_Bosaqir
Have a look at Product Bundle
That’s what I currently use but it’s not as convenient to use as using UOM and applying separate pricing and Barcodes to UOM.
Steps for using and maintaining product bundles too many and too cumbersome
Getting same scenario, using bundles too but not the desired scenerio.
In my case:
I have a pen with a barcode and also boxes with dozens with a different barcode. I will be helpful this feature because for inventory purposes, buys, and sell that will be awesome.
Seems like a tiny feature, but I know is not, hopefully the community get behing this.
This feature is still not implemented. Further discussion/requests can be found here:
I actualy make a customized doctype for my POS to get price by UOM. The problem with this is only work in my POS and not the ERP. This is very important feature becuase some customer used UOM meaure to set wholesale or reatil price.
The puzzling thing is, if you check barcode table in version 13, there is a UOM field besides the
barcodes, but it does not work.
Someone started work on it and forgot to conclude it?
@youssef you think this will add value in POS Awesome??
Yes this would be great to have. my client does not used the build in POS becuase for them POS must be offline. however i can share how i achive this in my POS and may be ERPNext can make in the POS for you.
This is where i make my customization and how ERPNext can include in base product.
In Item Price i create create a custom doctype for additional price. This doctye should be a child table if your are usning version 13.
On our POS it would look like this when i select/scan that product.
In the ERPNext
If you are using multiple barcode for the same item in the ERP you should also get the smae display.
When a product is sold with one of the UOM the ERP will deduce the amout of stock from inventory base on the UOM conversion factor. Example 1 box of RUM & RAISIN would dudect 60 each (smallest) from inventory.
There are lots of other thing we used UOM for.
This is just one example.
After made the following changes, it works
tested in purchase order form
The puzzling thing is, if you check barcode table in version 13, there is a UOM field besides the barcodes, but it does not work.
UOM Field in Item Barcodes in your particular case was added by POSAwsome. Its not In V13 By default.
See here.
If you enable Show Barcode Field in Stock Transactions in stock transactions and scan a barcode on anything else It uses the Default Unit of Measure | Default Sales Unit of Measure | Default Purchase Unit of Measure Depending on the Document Type
Honestly the original PR [Enhancement] Multiple barcode per Item by GSLabIt · Pull Request #11917 · frappe/erpnext · GitHub seems really pointless without the UOM but according to the Original Feature Request it was meant to track supplier barcodes that differ from company barcodes. [FEATURE REQUEST]: Multiple barcode per Item not different UOM`s
From what I can tell, it should be simple to fix in all documents that can scan barcodes by modifying erpnext/erpnext/selling/page/point_of_sale/point_of_sale.py at 77e00403c82ea0d15caab65e81659dc10de73bed · frappe/erpnext · GitHub to return UOM along with the Item code and Using the UOM in erpnext/erpnext/public/js/controllers/transaction.js at de4450aee9a68eadf3d806003f42cd55bb4df804 · frappe/erpnext · GitHub
- set the uom field in scan_barcode when it fetches from Item Barcode
You might want to modify the existing_item_row find statement on line 405 to include the UOM as it will replace the UOM every time. Example. purchasing 1 box and 2 items. scanning the box barcode will create a new item, scanning a single item barcode afterwards will update the existing item to 2 items instead of 1 box and 1 item.
Try by enabling Batch for the item. As each batch can have a different Selling Price.
Did you submit a pull request, adding this feature into core? This is a must IMO.
Thank you! 
Hey @szufisher the proposed solution seems accpetable. Can you send a PR for this?
I’ve created issue for tracking progress here: UOM specific barcodes · Issue #30777 · frappe/erpnext · GitHub
This is merged now and should be part of upcoming v14 
This isnt working for me in POS, ERPNext v14.74.3, so I made this script so I made it work with this code because my current version only seems to work for Sales Invoice Document which is not ideal for retail environment:
### multi_uom_pos.py
import frappe
@frappe.whitelist()
def multi_uom_scan(barcode, company=None, price_list=None):
# Find exact barcode row
ib = frappe.db.get_value(
"Item Barcode",
{"barcode": barcode},
["parent as item_code", "uom"],
as_dict=True,
)
if not ib:
return {"found": False, "why": "barcode_not_found"}
item_code = ib.item_code
# Choose UOM: prefer Barcode.UOM -> Sales UOM -> Stock UOM
uom = ib.uom or frappe.db.get_value("Item", item_code, "sales_uom") \
or frappe.db.get_value("Item", item_code, "stock_uom")
cf = frappe.db.get_value(
"UOM Conversion Detail",
{"parent": item_code, "uom": uom},
"conversion_factor",
) or 1
price = None
if price_list:
price = frappe.db.get_value(
"Item Price",
{"item_code": item_code, "price_list": price_list, "selling": 1, "uom": uom},
"price_list_rate",
)
return {
"found": True,
"barcode": barcode,
"item_code": item_code,
"uom": uom,
"conversion_factor": float(cf),
"price_list_rate": float(price) if price is not None else None,
}
js pos_multi_uom_barcode file:
// 🔥 Multi-UOM omni bridge v2 — per-item memory + optional merge
(function () {
const DBG = () => localStorage.multiUomDbg === "1" || window.__multiUomDbg === true;
const log = (...a)=>{ if (DBG()) console.log("%c[Multi-UOM]", "color:#4B8", ...a); };
const warn = (...a)=>console.warn("%c[Multi-UOM]", "color:#C53", ...a);
const sleep = (ms)=>new Promise(r=>setTimeout(r,ms));
const FRESH_MS = 10000;
const MERGE_SAME_ITEM = true; // ← set to false if you prefer separate lines
// Session state
const State = { pending:null, lastCode:null, lastCodeTs:0 };
const Prefs = new Map(); // item_code -> {uom, cf, price}
// Capture any input/scan → set lastCode and resolve server-side
function rememberCode(code){
State.lastCode = (code||"").trim(); State.lastCodeTs = Date.now();
if (!State.lastCode) return;
resolve(State.lastCode).then(snap => { if (snap) State.pending = snap; });
}
document.addEventListener("input", e => { const v=e.target?.value?.trim?.(); if (v && v.length>=3) rememberCode(v); }, true);
document.addEventListener("change", e => { const v=e.target?.value?.trim?.(); if (v && v.length>=3) rememberCode(v); }, true);
let buf="", last=0;
document.addEventListener("keydown", e=>{
const now=performance.now(), dt=now-last; last=now;
if (dt>1000) buf="";
if (e.key.length===1 && !e.ctrlKey && !e.metaKey && !e.altKey) buf+=e.key;
else if (e.key==="Enter"){ const code=buf.trim(); buf=""; if (code) rememberCode(code); }
}, true);
// Server lookup only (no client DB)
async function resolve(code){
try{
const { message:d } = await frappe.call({
method: "application.custom_app.custom.api.multi_uom_pos.multi_uom_scan", <<-- change this to the correct route
args: { barcode: code, company: cur_frm?.doc?.company, price_list: cur_frm?.doc?.selling_price_list },
});
if (d?.found) {
const snap = { item_code:d.item_code, uom:d.uom, cf:d.conversion_factor||1, price:d.price_list_rate, ts:Date.now(), via:code };
log("Pending set:", snap);
return snap;
}
} catch(e){ warn("resolve error:", e); }
return null;
}
async function enforceUntilStable(cdt, cdn, target){
const end=Date.now()+2500; let stableSince=0;
while(Date.now()<end){
const row = locals[cdt]?.[cdn]; if(!row) break;
const wantRate = target.price!=null ? Number(target.price):null;
const okU = row.uom===target.uom;
const okC = Number(row.conversion_factor)===Number(target.cf);
const okR = wantRate==null || Number(row.rate)===wantRate;
if(!okU || !okC || !okR){
await frappe.model.set_value(cdt, cdn, "uom", target.uom);
await frappe.model.set_value(cdt, cdn, "conversion_factor", target.cf);
if (wantRate!=null){
await frappe.model.set_value(cdt, cdn, "price_list_rate", wantRate);
await frappe.model.set_value(cdt, cdn, "rate", wantRate);
}
if (cur_frm){ await cur_frm.refresh_field("items"); cur_frm.trigger("calculate_taxes_and_totals"); }
stableSince=0;
} else {
if(!stableSince) stableSince=Date.now();
if(Date.now()-stableSince>250) break;
}
await sleep(80);
}
log("✅ enforced", {uom:target.uom, cf:target.cf, rate:target.price});
}
async function maybeMergeDuplicate(frm, row, target){
if (!MERGE_SAME_ITEM) return false;
const items = (frm?.doc?.items||[]).filter(r => r.name !== row.name && r.item_code === row.item_code);
if (!items.length) return false;
const prev = items[items.length-1];
// Only merge if UOM matches our target (to avoid mixing cajas with unidades)
if (prev.uom !== target.uom) return false;
prev.qty = Number(prev.qty||0) + Number(row.qty||1);
// remove the new row
frappe.model.clear_doc(row.doctype, row.name);
await frm.refresh_field("items");
frm.trigger("calculate_taxes_and_totals");
log("↪ merged into", prev.name, "qty:", prev.qty);
return true;
}
// Universal row-create hook
if (!frappe?.model?.add_child){ warn("frappe.model.add_child not found"); return; }
if (frappe.model.add_child.__muom_omni_v2){ log("omni v2 already installed"); return; }
const orig = frappe.model.add_child;
frappe.model.add_child = function(){
const row = orig.apply(this, arguments);
setTimeout(async ()=>{
try{
if (!row || row.doctype!=="POS Invoice Item") return;
// Wait until item_code appears
for(let i=0;i<25 && !locals[row.doctype][row.name].item_code;i++) await sleep(25);
const ic = locals[row.doctype][row.name].item_code;
// Choose target: fresh pending → per-item memory → fresh lastCode resolve
const fresh = (snap)=> !!snap && (Date.now()-snap.ts < FRESH_MS);
let snap = fresh(State.pending) && State.pending.item_code===ic ? State.pending : null;
if (!snap && Prefs.has(ic)) snap = { ...Prefs.get(ic), ts: Date.now() };
if (!snap && State.lastCode && (Date.now()-State.lastCodeTs < FRESH_MS)) snap = await resolve(State.lastCode);
if (!snap){ log("bridge: no fresh/cached barcode, keep defaults"); return; }
await enforceUntilStable(row.doctype, row.name, snap);
Prefs.set(ic, { item_code: ic, uom: snap.uom, cf: snap.cf, price: snap.price });
// lock targets so guards can snap back if edited
const r = locals[row.doctype][row.name];
r.__cf_lock_target = snap.cf;
r.__uom_lock_target = snap.uom;
// Optional: merge multiple clicks into one line
await maybeMergeDuplicate(cur_frm, locals[row.doctype][row.name], snap);
// consume this one-shot intent but keep per-item memory
State.pending = null; State.lastCode = null; State.lastCodeTs = 0;
}catch(e){ warn("omni v2 error:", e); }
}, 0);
return row;
};
frappe.model.add_child.__muom_omni_v2 = true;
log("🔥 Multi-UOM omni bridge v2 installed");
})();
// --- Locks for CF (and optional UOM) in POS ---
(function lockCFUOM() {
const LOCK_UOM = true; // ← set to true to keep UOM read-only too
// 1) Model-level guards: snap back to the enforced targets
if (frappe?.model?.on) {
frappe.model.on("POS Invoice Item", "conversion_factor", function (row, cdt, cdn) {
const t = locals[cdt]?.[cdn]?.__cf_lock_target;
if (t != null && Number(row.conversion_factor) !== Number(t)) {
frappe.model.set_value(cdt, cdn, "conversion_factor", Number(t));
}
});
if (LOCK_UOM) {
frappe.model.on("POS Invoice Item", "uom", function (row, cdt, cdn) {
const t = locals[cdt]?.[cdn]?.__uom_lock_target;
if (t && row.uom !== t) {
frappe.model.set_value(cdt, cdn, "uom", t);
}
});
}
}
// 2) Child DocField properties (covers grid & detail pane)
function setDocfieldReadOnly() {
const grid = cur_frm?.get_field("items")?.grid;
if (!grid) return;
grid.update_docfield_property("conversion_factor", "read_only", 1);
if (LOCK_UOM) grid.update_docfield_property("uom", "read_only", 1);
}
setDocfieldReadOnly();
// 3) UI hard-disable (survives re-render)
const style = document.createElement("style");
style.textContent = `
.pos [data-fieldname="conversion_factor"] input{ pointer-events:none!important; opacity:.7; }
${LOCK_UOM ? `.pos [data-fieldname="uom"] input, .pos [data-fieldname="uom"] select{ pointer-events:none!important; opacity:.7; }` : ``}
`;
document.head.appendChild(style);
function disableInputs() {
const cf = document.querySelector('.pos [data-fieldname="conversion_factor"] input');
if (cf) {
cf.readOnly = true; cf.setAttribute('tabindex','-1');
cf.addEventListener('keydown', e=>e.preventDefault(), true);
cf.addEventListener('wheel', e=>e.preventDefault(), {passive:false});
cf.addEventListener('paste', e=>e.preventDefault(), true);
}
if (LOCK_UOM) {
const u = document.querySelector('.pos [data-fieldname="uom"] select, .pos [data-fieldname="uom"] input');
if (u) { u.disabled = true; u.setAttribute('tabindex','-1'); }
}
}
disableInputs();
new MutationObserver(()=>{ setDocfieldReadOnly(); disableInputs(); })
.observe(document.body, {subtree:true, childList:true});
})();