Issue in event addition via FM 'TSEG_WRITE_UPD' in delivery

Date from inbound idoc is not getting updated arsenic required, lone lawsuit is added successful dates tab.

I person customized relation module ‘Z_IDOC_INPUT_DELVRY_DTC’ which is updating day successful Text tab of transportation successful AS-IS scenario. We person developed logic successful aforesaid FM to update aforesaid day successful Dates tab, but facing contented with FM ‘TSEGE_WRITE_UPD’. Right aft mentioned FM I americium utilizing Commit enactment to update each the details successful the database. Same details are getting updated database and adjacent successful the transportation too. But aft that modular V2 update FM is getting triggered and lone dispatch day is deleted from database table. Other details are contiguous successful TSEGE table. 

Please find the attached screenshots.

Thank you precise overmuch successful advance