Making Bank key as Optional

Hi All,

Is there any option to make Bank key as optional in IT0009? I have done the changes in the Screen modifications. When i try to create the Infotype, Bank key field is shown as Optional, but when i save the infotype without entering anything in the Banke Key field, i am getting an error''enter the Bank key''.

We are using the grouping 99 for configuration.

Thanks

Anjani