during RFQ creation with ref to PR: -Requisition doc. type NB not allowed w
Requisition doc. type NB not allowed with doc. type AN
Message no. 06052
It is not possible to copy a purchase requisition of document type NB to create a purchasing document of type AN.
Check your input.
If the problem cannot be resolved in this way, contact your system administrator.
The latter can make the necessary settings using the Implementation Guide (IMG).
I dont see any other reason so that this error will occur.Please check the customisation again and see that in Link Purchase Requisition against document type AN(RFQ) the entry NB with Item Category Blank with description is entered in both the colomns of Item category .Further after saving you log off and try to create RFQ with reference to PR after logging in afresh.