Hello
Looks like the workflow WS01200151 do not support multiple approval. If you refer to the task TS01200196 - BOR PDRELA_025 method APPROVAL, you will notice that this step sets the approval to complete using FM 'HR_TEM_APPROVE_PDRELA_025'.
Now if you would like to have a mutiple approval, then you will have to use a normal Decision Task - BOR DECISION method Process with Approve and Reject outcome. You can use loop or parallel processing . Once all aprovals are done ; you can call FM 'HR_TEM_APPROVE_PDRELA_025' in a background step to set the approval flag.
Regards
Sandy