As a rule, the employer cannot conclude a contract with an employee with whom he has previously entered into an employment relationship. However, there is a recognized exception that allows an employer to sign a secondary contract with an employee for a trial period. This requires that the position and associated responsibilities must actually be different. An employment contract for a trial period cannot be concluded with young employees for the purpose of vocational training. This agreement has a separate model. It is also not established in a cooperative employment relationship or prior to establishing an employment relationship on the basis of appointment, appointment and election.