How to make LT mandtory or set default value in BPA

Summary:

Out customer need to set 1 day leadtime for each BPA, is there anyway to set LT mandtory or set default value?

I tried in page composer,

but the LT in in [Item Attribute] tab ,so if I don't click [edit] in BPA line, I can submit BPA without LT.

Only when I click [edit] in BPA line, system will check the LT when save [Edit Line] screen

Is there any way to set LT mandtory or set default value?

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