We buy one (01) roll of cable that have 1000 RFT and we sell in RFT to customers so how we can handle this issue?

Hi, I can see in the screenshots you provide above that you have Nos as your Default Unit of Measure. Since you stock and sell in RFT, RFT should be your Default UoM, not Nos.

Frappe.io Frappe Cloud Documentation Partners Frappe School Marketplace Community Chat (new!)

Frappe Forum

Item UOM Conversion

clarkej May 13, 2020, 11:50pm 16

See also Why i cannot unset the "read only" for field conversion factor?