Professional Service for billing the product P003 is not allocated for usage based billing

Dear SAP Professional Services community,
APP:  Plan Customer Projects

I take with the supra APP and task to lawsuit the work bundle = Service based (unit) and the Service portion = merchandise / Activty benignant = U001. The related income terms for merchandise U001 (PCP0 - Project WBS) = 1,15 € / per portion (in full 10.000 portion for the 6 months declaration period). After task signifier merchandise and connected the billing tab I utilized the declaration type = usage based and aft participate the strategy automated allocate the merchandise = P002 alternatively of P003. 

Furthermore I can't make the monthly billing with the monthly portion = 500 and income portion terms = 1,15 € for the magnitude to beryllium billed = 575 € (revenue).

I anticipation you could enactment maine successful this regards

Michael