SAP Message PQ151 - Function module &1 is invalid

Diagnosis
There are two possible causes for this.

  • The function module does not comply with the naming convention
    • ('_CALC_VALUE_')
    • The function module is to be used for a criterion.

      • The following standard modules are not allowed for criteria:
      Addition:,,,,'RHPA_CALC_VALUE_ADD'
      Average:,,,,'RHPA_CALC_VALUE_AVERAGE'
      Percent:,,,,'RHPA_CALC_VALUE_PERCENTAGE'