My Requirement goes like this.

In a page, in Level2 scroll. I need to autoassign my sequence number field, based on another key field.

Field 1 is - RV Seq Number
Field 2 is - SEQNUM

User may enter value in RV Seq Number,and respectively SEQNUM should be autoassigned.

For EG :

If User enters in one row .

RV Seq Number SEQNUM
001 1
001 2
001 3
002 1
002 2
003 1
and so on...
To be noted - SEQNUM is grayed out for User and is auto assigned, were as RV Seq Number User enters value.