MB26

Hi, we copied an standard transaction MB26. Now , we are trying to do operations with "Z" transaction and the system shows the following error message:

"Good movement not posible with movement type &".

Is necesary assigned the movement types to the new Z t-code? Wich can be the reasons of the message? If we copied from the standar t-code MB26, its possible this kind of error?

Thanks in advance for the help

Regards

Enzo