We participated in the SAP ERP implementation in Cyfrowy Polsat. One of our tasks was to prepare the concept and software tools to migrate data into SAP ERP. The migration procedures included both basic and transactional data. In doing so, particular emphasis was placed on performance issues. Besides, limited time frame combined with a huge volume of data was a challenge. The migration process was carried out according to customer requirements. Currently, as a continuation of the project, we offer service and post-implementation support.