BSP Error on BPS record save

Hello...We started getting a BSP error when saving new records into our BPS cube through our web interface about a week ago.(everything work fine previously). Error message is:

Message E 000 cannot be processed in plugin mode HTTP.

Exception Class: CX_SY_MESSAGE_IN_PLUGIN_MODE

Program: SAPLRSDRI

Include: LRSDRIU06

Line: 92

Records get created fine in the buffer....this error only occurs on Save. Can someone suggest a way to trace this error so we can get a more useful error message? The BPS cube hasn't changed and is Active.

Thanks!

Chris