Not able to able a drive using _MAP

Hi,

I have a AIX machine, mdsbpower14. I have created a Samba share and trying to access from Windows XP machine.

I was able to Physically map to Windows machine to Z:

I am trying to map using _MAP to access the drive from Build Forge but it is not successfully happening.

In Environment window,

Type:Standard Variable
Name:_MAP
Value:Z:=//mdsbpower14.in.ibm.com/data/repo(root,*******)

I am trying to call a project running on windows passing this environment.
It is not mapping instead its showing this error

80 09/16/10 02:17PM MAP Attempting to map '\\mdsbpower14.in.ibm.com\data\repo' to drive 'Z:'
81 09/16/10 02:17PM MAP Unable to map '\\mdsbpower14.in.ibm.com\data\repo' to drive Z:. (Authenticated: 1202) (Default: 1202)

Please help me in getting this fixed and do the needful