How a program can be linked to function pool/group ?

Question: When I submit a job, program SD70AV3A and RSEOUT00 will be executed.
Some how it is running a function module Y_IDOC_OUTPUT_C2_INVOIC, which has process code of ZIC2 (Tran WE64). This function module belongs to function group YMOI (function pool SAPLYMOI). My question is how a program can be linked to function pool/group ?

Answer:
Because the programs are for processing IDocs and someone has told your system that those types of IDocs are processed using that FM.
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Rosie Brent

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