Error in RZ20 : No administrator defined in approval BAdI

Hi All,

We are working on SRM 5.0 extended classic scenario.

I got the error in RZ20 like shown below under the starting conditions like

Object BUS2121 <shopping cart number>: No administrator defined in approval BAdI.

and also one more error under the other errors

Error during setting of status for contract <contract number> to 'Approved'

I tried in checking BBP_PD but did not find anything.

can you please let me know how and where to check to find the root cause for this error.

Thank you

Regards

Jay