SAP Message SB344 - Enter a valid modularization unit

Diagnosis
You chose a modularization unit that starts with &V1& &V2& &V3& &V4&.However, this statement does not belong to a valid modularization unit.
Valid modularization units are programs (REPORT, PROGRAM,FUNCTION-POOL), subroutines (FORM, FUNCTION, MODULE) and events (AT,GET, START-OF-SELECTION and so on). Remember that the commands AT andGET may have meanings other than the declaration of events.

System Response
Your input is rejected.

Procedure
Enter a valid modularization unit.