How to avoid by code updated value from another data by null

ahmedba

Hi guys can any one help me in this task

I create field customer invoice no in Database B and Database A to give every group of sales invoice line unique number

this processes done IN Database B customer invoice no is sales invoice line table when this field is empty in same sales invoice no it remove value that found in database B

ex

Database A Database B

Sales invoice line table Sales invoice line table

No customer invoice no No customer invoice no

so-30 so-30 300

When i transfer data from Database A to database B in table sales invoice line

it clear or remove 300 and become no value

How i put condition by code tell him

when import

if sales invoice line table .customer invoice no field has value

not updated

Are this possible by code please help me

thanks.

ahmedba

I using Data Wizard import / export software to merge data from more branch to one branch
So that I need table sales invoice line not updated customer invoice no field in main database
How i do that by code