"Capacity requirement is invalid" error during PLOD creatio

Hi Gurus,

When executing in PP/DS the Product Heuristic (SAP_PP_02) we get a popup with following Warning & Error entries:

W In-house production 1490313, source of supply 0000000000002118493000B001, product 211849, location 3000

W Resource W39000-K_3000_001, location 3000

E Capacity requirement is invalid *

E Order not created for product 211849 location 3000 date 31.01.2012 00:00:00 quantity 39.420 KG

(*): Message no. /SAPAPO/OM601

Impacted work-center is modelled in ECC as a subcontracted operation, its assigned control key is flagged to Determine capacity requirements. Resource in APO is multimixed with a reference resource capacity, its Capacity variant & profile looks both OK.

Thanks for any valuable feedabcks.

BR,

Pascal.