How can i call Type pool in Function 'EXIT_SAPLMRMH_001'

Hi ABAPers

i copyed EXIT_SAPLMRMH_001 to ZEXIT_SAPLMRMH_001in SE37.

i am getting error when checking, that syntax error :The type "MRM_RBKPV" is unknown.

one dialogue box is also popup with "Type Pool MRM is not define". where can i define MRM, and how can?

please suggest me.

thanks in advance

hari