Differences between function modules

Hi Guru's,

I want to verify something.

I have 2 function modules, MASTERIDOC_CREATE_REQ_MATMAS and MASTERIDOC_CREATE_REQ_MATMAS_M.

Can the first function module only process only 1 E1MARAM segment per MATMAS idoc and the second function module can process multiple E1MARAM segments per IDOC?

Help will be appreciated.

Guido