I have two menu invoice and advanced cash and both have same action.

The requirement is that:
Invoice menu contain res.partner many2one as Customer field. res.partner have is_employee boolean field. 
When click on invoice menu res.partner select only customer from is_employee is true.

Same,

Advanced cash menu contain res.partner many2one as Customer field. res.partner have is_employee boolean field. 
When click on Advanced cashq menu res.partner select only customer from is_employee is false.

Please give me solutions.