SAP Message /MAP/AD01082 - Action not possible as a plant has been selected more than once

Diagnosis You want to adjust the date for several selected plants.Plant &V1& appears in the selection more than once, however.For this plant, the date adjustment would set one and the same startdate. According to the setting for multiple assignment, this is notpermitted. System Response The action will be cancelled. Procedure A plant must not be included in the selection more than once. Adjust theselection accordingly.