The output query from Donor Acknowledgement Letters contains records for which no letter printed
The output query may not match the letters merged.
If the record should not have been processed in Donor Acknowledgement Letters (for example, a gift was processed, marked as acknowledged, but no letter was sent), ensure that it is not included when processing Donor Acknowledgement Letters. This can be done by creating a gift query of only those gifts to receive a letter or by selecting the appropriate filters in the Donor Acknowledgement Letter parameters (not in the Mail Merge Wizard).
If the gift should have been processed, they are in the output query, but no letter prints, ensure that the conditional merge includes them. For example, the conditional field is Letter Code. You set up letters for the Annual Thank You and Pledge Thank You letter codes. If a gift has a letter code of Alumni Thank You, no letter will print. To print the letter, add a condition for Alumni Thank You.