SM66 Debug authorization for workflow debugging

Hi,

I want to debug an workflow method (ABAP OO) via t-code SM66 but every time I click the "Debugging" button and confirm with "Yes", I get an authorization error. The t-code SU53 shows me two failed authorization checks:

- Authorization object S_DEVELOP: Activity '02'; Object type 'DEBUG';

- Authorization object S_DEVELOP: Activity '90'; Object name ' '; Object type 'DEBUG'; P_GROUP ' ';

This also applies to t-code SM50.

Why do I need Activity '02' for debugging via SM66? I do not need to change any local variable during debugging so it is not really necessary.

Is there an SAP Note for this or another way to debug this kind of task?