You'll probably need to edit the GUI map for this window, changing the 'label:' value to a regular expression. The User's Guide explains this in some detail in the GUI map chapter. You can also find many threads in this forum on this topic.
I'm working on testing Oracle apps (11i) with win runner. As we create scripts, we perform standard operations such as creating a Purchase Order. When recording the window name is dynamic - op 141, next run its PO 142 etc... When we rerun the script, it can't recognize the window. How so I set it up to find the window?