Help on Cusstomizing ERPNext

[frappeval]

Did you make the custom field mandatory? If so, I think a similar issue was overcome here:

Pull Custom Field data from Sales Order > Material Request and so forth

Hello, my workflow is like this: Create Sales Order > Make Material Request > Make Purchase Order > Make Purchase Invoice I have added a custom field called “Customer PO No.” to each of the four forms mentioned above. Is there any way for the data I enter into the “Customer PO No.” field in the Sales Order to automatically pull into the Material Request and subsequently the Purchase Order and Purchase Invoice? I am using the hosted version of ERPNext. Thanks in advance.

It seems that making a custom link field mandatory stops the link working.