Oracle Forms

Hi All,

We are facing below issue in Oracle 10g Forms.

We are opening one screen with mutlirecord block and query the recod(First Session) and at the same time we are trying to query one more session(Second session) with same data.
While querying second session we have blocked the user to proceed further by using select ..... for update of columns and user will get error message
'Transaction is already locked by another user....'. and we have kept second screen opened.

Afterwards we are going back to first screen in first session and trying to update the record (Change price column and navigate to next item by using tab key. We are not using anhy other key) System is not allowing to update the record and screen is freezed and cursor control will go to items randomnly and displays below error message.

'FRM-41008 - Undefined function key. Press Ctrl + F1 for list of valid keys.

Could somebody pls explaining why above error message 'FRM-41008 ...' is showing for locking record issue ? Any trigger is firing above error message ?

Thanks in advance

Biju