How to know Functionalilty of Function Module

Hi all,
     I have found a Function Module use in one of the report program 'RPY_FUNCTIONMODULE_READ' However I don't know the functionlity of this FM. There is no Function Module Documentation available. how do i go about it.

Sanjay,
If the FM does not come with any doco, then there is no information about it in SAP (despite SAP saying that there is no doc available in EN - I logged on in Gernam and it said that there was no doco available in DE!). Generally if I want to find out how a FM works, I debug it, or ask the good people here on SDN! If all else fails there is always Google!
Cheers,
Pat
PS. 'RPY_FUNCTIONMODULE_READ' has a Documentation parameter but this passes out only the Parameters and their descriptions.

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