Same BU is added for Child job set when running ESS job set for Generate Revenue

HI Team,
We want to generate Revenue , Created a Test jobset, under child Jobsets we want to add new BU name for each job set. so that all BU's will run in one go however same BU is adding for all Jobsets (PFA)

For 1st Jobset added BU name

Same BU name is reflecting in 2nd Jobset as well, How can we solve this?
Requesting your help, thanks in advance.