private void DeleteRelationships(IEnumerable <CustomisationImportRequest> requests)
        {
            var response = new CustomisationImportResponse();

            var deleted = new List <string>();

            foreach (var request in requests)
            {
                foreach (
                    var metadata in
                    CustomisationImportService.ExtractRelationshipMetadataFromExcel(request.ExcelFile.FileName,
                                                                                    Controller, response).Values)
                {
                    if (XrmRecordService.RecordTypeExists(metadata.RecordType1))
                    {
                        if (!deleted.Contains(metadata.SchemaName) &&
                            XrmRecordService.GetManyToManyRelationships(metadata.RecordType1)
                            .Any(r => r.SchemaName == metadata.SchemaName))
                        {
                            XrmRecordService.DeleteRelationship(metadata.SchemaName);
                            deleted.Add(metadata.SchemaName);
                        }

                        //Assert.IsFalse(
                        //    XrmRecordService.GetManyToManyRelationships(metadata.RecordType1)
                        //        .Any(r => r.SchemaName == metadata.SchemaName));
                    }
                }
            }
        }