We had an issue with BPC NW 740 SP09 and CPMBPC 810 (SP03,SP04),CPMBPC 801SP05 recently, runtime errors CALL_FUNCTION_REMOTE_ERROR & DYNPRO_SEND_IN_BACKGROUND occurs when creating BPC model through BPC web client. This was confirmed as a bug and BW note 2122634 was released.
Keyword: UJN_API_CREATE_CUBE, SAPLUJN_API_BI_IOBJ