user click the replacement button in items assignment block serial number value field should be enable and user clicks return button serial number value copied to next line item and should be disable?

Hi Team,

user click the replacement button in items assignment block serial number value field should be enable and user clicks return button serial number value copied to next line item and should be disable?

User click return button first,then Serial number should be copied and disabled.next user click replacement button serial number field should be enable and if we enter 1234 and enter save then the value should get populated.how to do it please help.

Component - BT120H_CPL

View - BT120H_CPL/ItemList

context node - BTADMINI Base Entity BTAdminI

Attribute - serilano

Thanks

Kalpana