Identify Shipment number while TPSSHT01 inbound IDOC

Hi ,

I am using TPSSHT01 Idoc to detete Shipment ,

while creating Shipment , Shipment number is created through intrenal number assignment,

My problem is that now when TPSSHT01 Idoc is coming for delete , It is not able to identify Shipment to delete ,

Can you please suggest me how the ERP will identify the shipment number for delete when the shipment number is not known to other system since number is an internal assignment to our ERP.

Do we need any enhancement for this or SAP standard functinality will do this since I have tried to delete TPSSHT01 IDOC but not able to delete.

Regards

Arushi