version management ( item Text changes)

Hai Experts,

My client wants that If any changes in item text tab then they want version for this change item text .

I am observing the theards in sap forum .

http://help.sap.com/saphelp_erp60_sp/helpdata/en/8a/60b43bb7492147e10000000a114084/content.htm

i see the above link but , I am doing each and every settings for version'But when i change po item text tab , and check the po Its not showing error . can you telll me table and field name for item text for PO.

I doing the following settings

path:mm-purchasing-version management-Set Up Version Management for External Purchasing Documents

Doc.cat will be F means po, Doc type will be NB & p.org of ur client

in control data active both version acrive & version 0 ok.

in field selection reason, shorttext& requestor is required option & save

give the reason for ur inputs

in Set Up Change Displays category willbe f for all doc types

But its not asking version confirmation but showing the dsplay changes I want new version for if any changes in item text