I tired to use above methods, but failed.
I solved the problem using another approach.
first, I made a) DSO for 2LIS_06_INV datasoruce with delta extraction.
second, I made one more b) DSO for customizing field with full extraction.
finally extraction from a)DSO to Cube with full mode. When this full extraction is run, the values of custom field, which is not extracted before, were input using the routine from b)DSO.
Thanks a lot.