In Oracle Project Parent Task No. "Trans Finish Date" auto end dated when clicked on create subtask

Problem Summary

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Parent Task Number "Trans Finish Date" auto end dated when we clicked on create subtask for the same

Problem Description

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Parent Task Number "Trans Finish Date" auto end dated when we clicked on create subtask for the same Parent Task number.

means when we are creating new subtask by using the "Create Subtask" button under Project Template

Navigation :- PA Super User->Project->Find->Open->Details->Create Subtask

Error Codes

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Main task auto end dated when we create sub task for the same main task