The start and end of the business trip and other conditions of the trip are determined and approved by the employer (see Section 153 of the Labour Code), therefore the employer may also allow the employee to interrupt the business trip (however, it should be internally regulated) on his/her part, i.e. for private reasons (visiting friends, cultural events, etc. in the place or in the vicinity where he/she has been sent, i.e. he/she may leave a day or two days earlier or stay and go home later). It is not an interruption, for example, if the employer sends the employee a day earlier to rest after a long journey. The special purpose allowance can then be used to cover the usual costs directly related to the project (travel to and from the project and the usual travel allowances for the work trip).
If the employer authorises the interruption of the working trip, the employee's entitlement to travel allowances should be defined, and the start and end of the interruption of the trip should be clearly stated, or the date of the working trip clearly defined.