Extra COMMIT for RFM Calls through JCo

I am using JCo to develop a generic connector to SAP. I am making BAPI calls to SAP by invoking the corresponding RFM. I have read in some documents that some BAPI calls require extra commit(BAPI_TRANSACTION_COMMIT) to update the SAP database. Do corresponding RFM calls also require extra commit to update the database? If that is the case, how can I find which RFM's require the extra commit?

Thanks in advance.