How do you autocreate MRP generated requisitions to a blanket purchase order?
First initiate the Release Purchase Requisitions from the Planners Workbench.
Material Planning -> MRP -> Workbench
Second, in the Purchasing Responsibility, AutoCreate the requisition to a Blanket PO.
For Auto create to find these requisition lines from MRP, the Blanket PO line type must be set to Goods because the MRP Purchase Requisition is always created with a line type of Goods.