Validation for empty field in related module before save

First. To create logichooks you need to have some programing experience. It requires creating and modifying files in the back end.

Here is the documentation related to logic hooks:

Then you need to learn to work with beanns to load the related account bean from your logichook:

Check this sample. The last post seems to be related to your issue:

Here is a sample on how to redirect from logichooks:

Thanks,

BrozTechnologies