When merging Donor Acknowledgement Letters, there is an option under Format to select how the letters will be sorted. Query is an option and the merge should be based on how the output is sorted in query.
We have evaluated this issue and have determined it will not be addressed in the program in its current state. In this case, we believe the risks and challenges outweigh the potential benefit of resolving this issue. We strive to select the most impactful changes and issues to address with each release to accelerate the rate at which we deliver new features while sustaining the highest level of quality for our customers.
Steps to Duplicate
Create gift query
Add output fields
Choose field(s) to sort by
Save and close query
Go to Mail > Donor Acknowledgement Letters and create a new letter
Add query and create letter
On the format tab under Sort, select to sort by query