Hello Jitandra,
You are correct, I only used the standard FM: IDOC_INPUT_PORDCR1 and standard basic type: PORDCR103 for inbound IDoc process to PO conversion.
But.. here my requirement is to get data from presentation server's file (local file within ECC not from any other system), so I have to collect the file data and populate IDoc segments.
Here I populated IDoc segments and used FM: IDOC_INBOUND_WRITE_TO_DB from my standalone programe, fyi.. all the partner profile setting have been set correctly.