Promised Ship Date has to be Friday of the week of Schedule Ship Date

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Hello Friends

My customer is requesting to have Promised Date on Friday of the week of Schedule Ship Date.

I am getting schedule ship date between Monday and Friday based on Organization Calendar and Transportation Schedule. I know I can use Pre-transformation rule to Populate Promised Ship Date. But how we can make the Promised Ship date has to be populated on Friday Only.

Please suggest a way to achieve this requirement.