How to make planned specimens as unplanned?

Use Case: User added specimens with incorrect type and there is no specimen requirement to which this specimen can be mapped. This specimen is collected very rarely hence instead of adding a new specimen requirement, user wants to make this specimen as unplanned.

Steps to make the planned specimen as unplanned

Using export, download the data for specimen (for backup)
In the file you either keep only the below columns or just update the backup file to set the requirement code to ##set_to_blank##
This will make the specimens as unplanned. (Note: This will not affect the child specimens)
You will then be allowed to make changes to this specimen.