Requsition submitted for approval without entering mandatory DFF values

Summary:

We have enabled mandatory DFF's at the requisition distribution level and also have enabled the suggested buyer field and made it mandatory also.

If we create a PR with multiple lines and if the user enters these DFF values only for line 1 and submit the PR,its submitted for approval even if the data is not entered for other lines.

We observed that the system prompts to enter the values only if user clicks on the corresponding line.

Kindly let me know if this is the standard functionality or is there any setup for this

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