The domain addressed by this CWA is the E-codification of substances used by compounding pharmacists in pharmaceutical compounding. The present document specifies the technical requirements for creating the record structure and E-codification of the various substances supplied by commercial suppliers and used by the pharmacist in the pharmacy for preparing ""Magistral Formula"" and ""Formula Officinalis"" as defined by the European Directive 2001/83, Article 3, Paragraph 1) and 2). The CWA includes a record of the supplier of substances. ""Magistral Formula"" and ""Formula Officinalis"" are not themselves part of the present CWAThe users of the CWA are the