- Changed test payload from 'saleline_set' to 'catalogsaleline_set' - Removed extraneous fields 'payment_method' and 'catalog_sale' from test data - Made 'catalog_sale' read_only in CatalogSaleLineSerializer to allow nested creation
- Changed test payload from 'saleline_set' to 'catalogsaleline_set' - Removed extraneous fields 'payment_method' and 'catalog_sale' from test data - Made 'catalog_sale' read_only in CatalogSaleLineSerializer to allow nested creation