Userexit for tx MIRO on extension LMR1M001 and component EXIT_SAPLMR1M_002

Hello community!
I’m new in SAP ABAP, I’m trying to implement a user exit for transaction MIRO on extension LMR1M001 and component EXIT_SAPLMR1M_002, to add a validation to the reference field, but it doesn’t go into the user exit, it doesn’t stop at the breakpoint. ¿Does anyone know because it could be?

Thanks a lot
Grettings

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