Enrolling worker to compensation plan in HR (AX 2012 r2)

Am trying to enrol a worker in HR to a fixed compensation plan already created

1373.compensation.jpg

When I try to select Step, it does not show in the drop down

1882.compensation1.jpg

and when I click OK, this is what I get:

6378.compensation2.jpg

It says: The value ‘00004’ in the field ‘position’ is not found in the table ‘position details’.

Please, what can I do?

Thanks.