Reaasgn Approver from Administrative task getting error "You must assign this to someone else. (FUN-

Content

I created Purchase order, Submit it. But when i go to BPM Workarea in Administrative task tab, tried to Reassign the Approver for my purchase order ...getting the below error

"You must assign this to someone else. (FUN-720540)"

 

Anyone having idea what is wrong ?

 

Note:- I was able to assign my user to reassign user field before, but not now.

 

 

Version

20B