Originally asked by Salma Nairi on 11 November 2021 (original question)
Hi
we synchronize a Labels from A to B only → unidirectional synchronization
but when we set labels in instance B and labels in instance A is empty → lables in B are erased
How can we avoid this behavior , and don’t sync empty value from replica
it’s quick urgent 
Thanks a lot
Answer by Salma Nairi on 15 November 2021
hi
sorry , i re tested this implementation but it doesn’t work
labels null value always erase values on destination side
very strange , a control is not checked
Answer by Ariel Aguilar on 11 November 2021
Hi Salma,
Maybe you can try to add to the Incoming sync:
if (replica.labels != null) {
issue.labels = replica.labels
}
Then on the B side, you should look after the outgoing script I know you said it should be unidirectional, but if there is an outgoing sync rule that needs to be removed. It might need to be adjusted.
Kind regards,
Ariel
Hi
thanks for your quick response
i put control on ongoing rules and value is not erased
if (issue.labels != null) {
replica.labels = issue.labels
}