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This problem seems to be a bug. However, I found the following workaround:
1) Locate the UML classes on the new diagram;
2) Try to create a new binary association between them. The BPA tool will check if there is an existing association between these classes and it will open a dialog box to ask you whether to create a new association or to use an existing one;
3) Select the necessary (existing) association in the dialog box instead of confirming creation of a new one and the selected association will appear on the diagram.