returning data less than rfc

Hi gurus,
Right now i use SAP BC 4.8 and create a flow service that to execute the RFC (yth_myRFC) in our SAP 4.6c.
Now my problem is, I executed my RFC (yth_myRFC) in SAP it return data around 50K records. But I executed the flow service in my SAP BC 4.8 (this service also execute the yth_myRFC), it return data around 40K records. 10K records didn’t transfer into the flow service. my data losted.
Please guide me how to solve this problem.
thank you very much