Move VBAP-PS_PSP_PNR number to DXVBAP in EXITS

HI Experts,

I have to use "EXIT'_SAPLVEDA_001" for FM " IDOC_INBOUND_ORDERS"

to enhance the inbound idoc , Here i need to pass the PS_PSP_PNR number from VBAP table to DXVBAP parameter which available in Exits " "EXIT'_SAPLVEDA_001". That PS_PSP_PNR number already available in Inbound IDOC under E1EDP02 Segment but the DXVBAP parameter in Exit does not refer to any Associated type

In this case How can i move the PS_PSP_PNR number to that DXVBAP.

Thanks in Advance