Shipment end status updation from Idoc

Hello,

we are  creating/Updating our shipment document through incoming SHPMNT05 idocs in ECC (message type=shpmnt) . Once the shipment is created from idoc, we want change shipment idocs to come and update the neccesary details in shipment document.

our requirement is to update the planned shipment end date and actual shipment end date from idoc.

I need to know which idoc segment (with qualfifier ) and field carries the "planned shipment end date " and  "actual shipment end date " ?

regards

Pamela