Overhead structure issue

Hi experts,

I have configured OH calculation through OPL1.Then i try to configure Overhead structure through KSAZ.

In oh structure,i have to define following data:

Row Base O/H rate Description Fr To Credit

10 B000 Material

20 C000 Material OH 10 E01

But while i want to save it following errors comes:

Overhead C000 does not exist.

And while i put depedancy in D000 there,errors comes:

Condition D000 does not

Please advise.

Regards,

Samar