The document type of a purchase requisition created in MRP can be defined in Customizing for MRP.
The document type of the purchase requisition has no control purpose in MRP. It is displayed in the MRP list or the stock/requirements list for information purposes only.
In step,Define external procurement, you can define the document type specific to MRP groups for the purchase requisitions. The system uses the appropriate document type when creating a purchase requisition in MRP or when converting planned orders into purchase requisitions. You can choose from the following document types:
Purchase requisitions for direct production are always created with the document type, standard purchase order (NB).
You assign the MRP group to the material in the material master record.
To set document types in MRP, you have to have created the document types desired for the purchase requisitions, in addition to the standard type NB in Customizing for Purchasing.
Usually, it is not necessary to create document types. If no document type has been entered, the system uses document type NB to create purchase requisitions.