Master DS 0customer_attr enhancement - field does not appear

HI,

I am enhancing data sourece 0customer_attr. The field to be added is ZAPDAT.

This is 'z' field added in KNA1.

I followed the following steps..

RSA6

DS - 0customer_attr enhance extraction structure

Added field ZZAPDAT.

checked the structure.

Activated the struture.

Again through RSA6 used change data source to remove the defauld tick for hide field.

My problem starts here the added field in the structure does not appear in this screen.

Am I missing any step.

Regards,

Mahendra.