WRP1 and planned orders

Question

Hi, we have SAP Retail and we have installed a plant which manufacture some products. At this point we have configured all the production process with recipes and all the stuff related however we have experienced some troubles. We have discovered that if we create materials with MM01/MM02 we could not modify them with MM42, we have also discovered that the materials saved with MM01 cannot be replenished using WRP1. Our produced articles are FERT, ROH  and HALB and what we plan to do is to run the MRP with WRP1 and generate planned orders that will be converted in production orders.
We run the WRP1 but SAP is generating us purchase requisitions but we would like this transaction to produce planned orders. Or if its posible, transform this purchase requisition in production order, which as I read it doesn't seem posible. I tried to generate a PO document with this purchase requisition and it generates a Framework purchase order (FO) and I don't know what that is.
The overall strategy is to configure with MM41/MM42 the supply source of the stores as 'Stock transfer' (2)  and set procurement type 'F' so WRP1 generates purchase requisitions that eventually will be transformed as stock transfer orders which the vendor/supplier is going to be our distribution center. The DC is the place we are mounting the in-house production.
Our supplying plant has procurement type 'X' or 'E' but with this one we want WRP1 to generate planned or production orders with the replenishment requirement that includes all the requirements from the stores, so when we have all the production we could supply articles for the stores.
Is this the right approach? What should we do in this situation?
Thanks in advance
PS. We do not plan to use the MD01, MD03 or MDBT for MRP.

Answer 1

Assign checking group in material master
Define checking rule
Define scope of check.Scope of check is to include what type of stock/Receipts/Reqmts are to be considered during ATP
Define checking control(Here you check the availability either at order creation or Release for plant/order type)
Based on the above settings when ATP is carried out,Missing parts list is determined for the order.
For planned orders additionally we can have the check against planned independent requirements. Here system only checks the dependent requirement quantities against the open planned independent requirements created for the components.Therefore, neither the ATP quantity nor the receipts or stocks are included in this availability check