Are you using an IDOC like MATERIALRESERVATION_CREATE1 (FM IDOC_INPUT_RESERVATION_CREATE1) which use BAPI_RESERVATION_CREATE1 (or a more recent version)
The segment E1MATERIALRESERVATION_CREAT should already contains the external number E1MATERIALRESERVATION_CREAT-RESERVATION_EXTERNAL generated by the original outbound process?
Nevertheless the BAPI allows some Exit/BAdI :
Also for reference there is a BAdI for internal number range BADI_NUMBER_GET_NEXT
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