Hi @hasret_akbiyik ,

I have come across this error however it was resolved using bug id 153532, this was released with UPD9. It can happen when the activity has following parameters.

Progress method – Manual
Manual progress >> Level of entry – Activity

There should have a Resource-group connected to the Activity

As a workaround you can try to switch Activity-progress-method back and forth and see whether it works.

Reason for error identified in bug 153532 :
In Activity_Element_API.Validate_Manual_Cost_Progress the Progress-fields get set to 0 if no value. But Activity_Element_API.Check_Common___ checks for NOT NULL.

Hope this helps.

Best Regards,

Kasun

We tried to switch Activity-progress-method back and forth and it worked. Thank you so much :)