The usage of src attribute in the token-map verb of a policy was discontinued with Identity Manager 4.8. The src attribute is replaced with the source attribute.
However, if you have a policy that was created with versions prior to Identity Manager 4.8, and you want to modify all the occurrences of src to source, try the following workaround.
In the Identity Manager 4.8.3 version, Designer introduces a new Replace feature that allows you to search for strings and replace them as per your convenience.
Launch Designer.
Import the required project to Designer.
From the Modeler view, launch the Search/Replace dialog box.
For more information on launching the Search/Replace option, see The Search Results View in the Understanding Designer for Identity Manager.
In the Search field, specify the value as "src=".
Select the Enable Replace checkbox.
In the Replace field, specify the value as "source=".
From the Filter list, select the policy script.
Click OK.
Save and deploy the changes.