how to define user defined dimensions in script logic

Hi Team,

i have created user defined dimension AN_PRODUCT and a property agent commission.

but getting an error ,when writing the script logic ,Invalid dimension AN_PRODUCT in the model.

*XDIM_MEMBERSET AN_ACCOUNT = TOP_PER_UNIT

*XDIM_MEMBERSET AN_CATEGORY = ACTUAL

*XDIM_MEMBERSET AN_ENTITY = USA

i need to define product dimension here..

*XDIM_ADDMEMBERSET {dimension} = {members set}

*XDIM_MEMBERSET AN_RPTCURRENCY = LC

*XDIM_MEMBERSET AN_TIME = 2005.JAN

could you please let me know which function to be used to add the user defined dimension in the logic.

thanks in advance for your quick answers.

Aditya