3360251 - Flow builder 1.0: Error message "Package or change request/task is invalid" appears while regenerating loading class in FCLM_FB_UTIL

While regenerating loading class for Flow Builder in development system, the following error message appears:

Package or change request/task is invalid

Message no. FCLM110

"Image/data in this KBA is from SAP internal systems, sample data, or demo systems. Any resemblance to real data is purely coincidental." 

• S/4HANA 1610, 1709, 1809, 1909, 2020, 2021 (Flow builder 1.0)

FCLM110, generate loading class, assign loading class, ZCL_FCLM_BSEGFLOW_SAMPLE, ZCL_FCLM_MMFLOW_SAMPLE, invalid package, invalid change request/task, FCLM116 , KBA , FIN-FSCM-FQM , One Exposure , FIN-FSCM-CLM , SAP Cash Management , Problem