SAP Data retrieval inconsistency

Hi Experts!

I precocious encountered a discrepancy successful information I retrieved with 2 methods connected SAP Netweaver:
1) SE16 transaction and 2) RFC_READ_TABLE function

The RFC_READ_TABLE missed immoderate of the rows which SE16 showed. There were nary filters used, nary truncation, and the information requested was conscionable the BELNR file of the BSEG table. The aforesaid lawsuit was utilized to authorize the retrieval. Anyone knows what could beryllium a origin arsenic to wherefore immoderate rows are not extracted via RFC_READ_TABLE?

Thank you!

Niko