MRP for FG not looking at Raw Material

Question

HI all,
I'm running MRP for finished goods material against my production plan (created in MD61).   The material has a BOM component but when I run MRP for the FG its not looking at BOM component to consider raw material) availability and thus proposing dates solely based on the Production Plan and not any other requirements.  
It simple creates the planned orders based on the production plan entered into MD61.  The dates for the planned orders don't take into consideration that on the suggested Production date there is not enough raw material to actual produce the product.   
The Production plan does drive requirements to purchase the raw material but the dates are not neccessarily correct to get product to the warehouse on time for production run.   
FG set up:
RP Type:                                PD - MRP
Lot Size:                                 EX u2013 Lot-for-lot Order Quantity
Safety Stock:                         125  - EA
Availability Check:                   02 u2013 Individual Requirements
Procurement Type:                   E - In-House Production
In-house Production:                 1 - days
Planning Strategy:                   10 u2013 Make-to-stock production
BOM / Raw Material set up:
RP Type:                                PD - MRP
Lot Size:                                 EX u2013 Lot-for-lot Order Quantity
Availability Check:                   02 u2013 Individual Requirements
Procurement Type:                    F - External Purchased
Pland Del Time:                         3 - days
GR Process time                       1 - days
Planning Strategy:                   40 u2013 Planning with Final Assembly
How do I get the MRP for the FG to not only create the planned orders from the production plan but also take into consideration raw material availability?   Thanks for your help!!

Answer 1

VC,
I need to the PlndOrd date for FG to take into consideration raw material availability...otherwise it's pretty useless to the site.
  I guess you are unfamiliar with the workings of standard MRP.  MRP in ECC as delivered by SAP will not support this requirement.
There are a couple of assemble to order strategies that may be suitable for you, if all of your RM materials exist in the FGs BOM.  Strat 81 and 82, which are intimately linked to the Sales order ATP check.  These strategies are not compatible with FGs forecasts.
http://help.sap.com/erp2005_ehp_06/helpdata/EN/41/19206a45fd11d188ff0000e8322f96/frameset.htm
In SAP ERP, MRP just does not check the availability of components during the MRP run.  The Net Requirements calculation of a component part (which is the closest concept within MRP to an Availability check) takes place ONLY after all parent parts are completely planned, and all parent part planned orders have been already been generated and saved.  In effect, when MRP is running, information is neither gathered nor considered as to what the planning situation will be for the components.
APO has several solutions that, depending upon the detailed requirements, might provide a solution.  A common one is to first run an MRP type heuristic, to create planned orders for all the shortages, and subsequently run a 'Bottom-up' scheduling heuristic to bring supply and demand dates into alignment, based upon pegging information.  ERP does not have this functionality.
Of course, SAP ERP is infinitely modifiable.  If you have enough time and money, you can write custom code that will torture ERP into filling any Business Requirement.
Best Regards & Good Luck,
DB49