Suggestion:
For a typical Purchase cycle with requirement, vendor selection and ordering, quotation selection is required.
Quotation Option field in item master, Is option to specify quotation required or not (Y/N).
If in the item master quotation is set to ‘mandatory’ for the item to be ordered system restricts PO creation without quotation for that item.
Note :
In direct creation of a PO, When the material is a regular item and market driven, order to a supplier can be created without an indent Directly from Indent option to create PO: In this option all items must be with the Purchase policy as ‘quotation not required’