This paper is concerned with the creation of a Quality Agreement to outsource reference samples and retention samples as well as the creation of a plan for auditing the external warehouse based on the Quality Agreement. A Quality Agreement is a contract to ensure quality, in this case, the quality of reference samples and retention samples in an external warehouse. The Quality Agreement contains the key points of storage. In addition to temperature and humidity also the procedure at the handover of the reference samples and retention samples was described, as well as a definition of behavior in case of deviations. To ensure that the Quality Agreement conditions are properly met a plan to auditing it was created. In addition, questions regarding the staff and the behavior in case of deviations and emergencies are provided.