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Hola Cristobal,

Creo que tienes estas user exits:

Transaction Code - MIRO Enter Invoice

Exit descripción

LMR1M001 User exits in Logistics Invoice Verification
LMR1M002 Account grouping for GR/IR account maintenance
LMR1M003 Number assignment in Logistics Invoice Verification
LMR1M004 Logistics Invoice Verification: item text for follow-on docs
LMR1M005 Logistics Inv. Verification: Release Parked Doc. for Posting
LMR1M006 Logistics Invoice Verification: Process XML Invoice
MRMH0001 Logistics Invoice Verification: ERS procedure
MRMH0002 Logistics Invoice Verification: EDI inbound
MRMH0003 Logistics Invoice Verification: Revaluation/RAP
MRMN0001 Message output and creation: Logistics Invoice Verification

También tienes un programa en este portal que metiéndole la transacción te dice las ampliaciones disponibles.
Un saludo.