A Calling Party Transformation would only change what is seen on the display in the called state, it wouldn't change what is shown in the missed/recived calls directory. That will always show the call as per the global normalization done in CUCM. To solve this in an enviroment with mixed phones, with phones that can support the + sign and phones that don't, you would need to globaly normalize the incoming calling number in a format that doesn't have the + sign. From the description that would in your case be to add one 0 in front of the calling number instead of a +.
But that might not be what you want depending on other requriment, possible a better solution would be to replace the rather old 7940s with phones that support the + sign.
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Then you need to change the global normalization to adapt that to fit your needs.
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