Some of my users are having problems to post an item because the option Condition and Transactions are not working, the variables of the problem are too extensive and the only way to resolve ajax issues is to disable or change the Condition and Transactions to a normal dropdown, how can I do that?

Thank you for your time.

@Carlos
There is no ajax behind.
On item-post.php (-edit.php) function is used:
veronika_simple_transaction()
change it to:
veronika_simple_transaction(true)

Thanks is working now