Job B functionality and multiple employment

Hi,

I have an employee who is set up as multiple employee in another location however I'm not able to see this additional job as 'Job B' on the rota. The dropdown option has only Job A or Unassigned to choose from. This causes issue with tronc module as Job A is his main job and his tronc earnings should be calculated from hours in Job B but I'm not able to select that.

Does anybody have solution to that or a similar problem? I'm sure it's just a configuration problem...

Thank you.