Unapplied an unidentified fields not editable

Hi !!

Does some know why the Unapplied an unidentified amount fields in the receipt summary window are in grey ( not available to edit) for some users and for others are?

Both users are using the same responsibility.

This in Receivable R12.

Problably a preferences or setup that needs to be done at user level?

Any help would be appreciated.

Thanks in advance,

Claudia