issue with F4 help for generic account assignment

Hi,

I have enabled a new account assignment category Generic account assignment, like cost center as you can observe in the screenshot. I have enabled the search help for this account assignment category by dynamically binding the value_help field.

Now the problem is, the account assignment description is not auto populated upon selection of a value of assign number from the F4 help. But for cost center and other standard account assignment categories, upon selection of a assign number value from the F4 help, it is fetching its description too into account assignment description field along with the assign number.

And the account assignment description is editable for Generic Assignment Category whereas for all other standard account assignment categories, the description field is read-only.

Please help me how to achieve this.

Thanks,

Karthik.