How to correct chartfields for AR line of On Account Item

Hi,

We have an On Account Item which we are trying to apply to another invoice in a maintenance worksheet. The entries remain even after building the worksheet and running AR Update. We need to correct chartfields for the AR line of the On Account Item.

I am trying to correct the chartfields through the below page but none of the chartfields are editable---

Account Receivables>>Receivables Maintenance>>Maintenance Worksheet>>Update Accounting Entries page,

Is this working per design or should we have the chartfields editable here?

Thanks,

Debolina