Load Group Org before save

I have tried to interact with the group organization in the group edit form via hooks but although I can set the group_id & the organization_id I get a fatal because I don't seem to be able to store the group_organization_id in the right place. Given that this table has 3 variables & 2 must be passed to the add action for it to succeed (group_id & organization_id) adding a find before saving to grab the id if it exists. These 2 variables are required to be unique