You may not assign any sources of supply to items without material
Message type: E = Error
Message class: 06
Message number: 728
Message text: You may not assign any sources of supply to items without material
What causes this issue?
You can only determine sources for items containing a material number.
System Response
The system cannot assign the item to a source of supply.
How to fix this error?
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.