3478499 - Error Message "(400) Bad Request" When Opening an Input Schedule

When opening an input schedule while another input schedule of a different model is open, the user encounter the following errors:

• The remote server returned an error: (400) Bad Request.
• Server message:code: SY_530
  severity: error
  description: An exception was raised
  log id: 00qw800T7j{3mdlpp564xG
  DATAVALUE:
  MDX:
  V1:
  V2:
  V3:
  V4:-----------------code: UJ0_EXCEPTION_020
  severity: error
  description: An exception was raised
  log id: 00qw800T7j{3mdlpp564xG
  APPSET_ID:
  OBJECT_ID:SPECIFICATIONC
  OBJECT_TYPE:
  USER_ID:-----------------Framework message:
  The remote server returned an error: (400) Bad Request.

SAP Business Planning and Consolidation, EPM Add-in 

Bad Request, SY_530, An exception was raised, UJ0_EXCEPTION_020, BPC, epm, input schedule, model, epm report , KBA , EPM-XLS-REP , EPM XLS Reporting , EPM-BPC-NW , NetWeaver Version , Problem