When you have created ID numbers on a piglet in a litter you can change one or more ID numbers if, for example, there is an defect ear tag or the numbers are not in sequence.
Go to Breeding - Breed progeny
In the filter line, enter the tag id you need to change.
When the animal is found you just overwrite the tag id with the correct number.
If information is already sent to a breeding company this change will also be updated there.