When attempting to merge two organization records a message is given regarding duplicate matching gift conditions which prevents the merge.
Download and install the latest service pack, which contains all fixes from previous service packs. If you are running an older version, download and install the latest version and then the service pack.
Steps to Duplicate
1. Go to Constituents > Duplicates > Merge two constituents 2. For the Source record use a record 3. For the Target record use a different record 4. Select the desired Merge Configuration 5. Click Merge