External item numbers don't get updated in purchase requisition lines when the vendor value is changed on the line manually to a vendor that doesn't have an external item number; or when the vendor is changed based on trade agreement setup (for example when quantity is changed, and a better fit vendor is inserted in the line).

This was fixed by Microsoft and worked OK, however due to issue with lot of customers fix was disabled this year (LCS issue 821321).

Idea is to provide better fix or even set this like parameter so customers who needs it can turn it on, and other can work with standard as is.