How to enable Goods Receipts for Blanket PO, I tried with the Item category settings it is disabled. Any one help we need to have goods receipts. Thanks.
In case of Blank PO, you use Item category as "B" i.e. Limits so in this case you can not do GR since this is attribute of Item Category "B" which you can check in SPRO > MM > Purchasing > Define External Representation of Item Categories
Here you can see the Indicator "PO Item Linked" is not active so it doesn't allow to do GR.
If you want to use validity period for purchasing documents then create contracts and then create release orders w.r.t. contract.
And for Framework Order OR Blanket PO, refer following link;
[Blanket Purchase Orders|http://www.sap123.com/showthread.php?t=41]