Cost Center Substitution - KB21N

Hello,

I am trying to use a Cost Center substitution on transaction KB21N to bring in the employees HR Mini Master Cost center when manually charging labor through KB21N. The problem is that the susbstitution populates both Sending and Receiving Cost Centers on the line item.

This means that I cannot charge labor to orders or project/WBS because I get a multiple Cost Object Error. Has anyone used a Cost center substitution in KB15N or KB21N that can share the experience.? Any help would be appreciated.

Thanks,

Justin