More then one replacement id

Summary:

Hi Teamm- we have unique customer requirement where customer would like to raise requisition for multiple backfills on same requisition and have to capture more then 1 replacement id for that we have created a comment field to add replacement more then one by comma separated.

now they wanted to system to validate if number of openings are 20 then in comment fields how many comma's are there to ensure atleast validation is there

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