We have been using IFS Apps 8.0 version there have been no instance where the system will show the pop-up message that Manufacturer ID is mandatory though it is not a mandatory filed in IFS.
Error message - Manufacturer doesn’t exist for so and so part for this supplier.
The above error message comes while processing a PO from PR either directly or through RFQ (Order quotation) process.
Manufacturer ID is associated for any Purchase part in Supplier for Purchase part screen and its not a mandatory field.
Need more insights on this if there’s any internal setting at the Supplier/Site/Company/Purchase Part Basic data which is causing this issue.