Hello Gopinath,
set some flag in get method of date field of context node ERPADMINH context node....nd set it inside some global varibale inside implemetation class...
First find view and component of line item where date field is present....
go to get method of date field of line item...and reach the context node ERPADMINH by relationship using get_related_entity method of cl_crm_bol_entity class.
fetch value of date field of context node ERPADMINH context node...and when there is some value in it...then set this value in set method of date field line item context node...
Please apply this logic..it will be helpful to you.
Thanks,
Amit