In case of invoices with many items (>200), performance problems can come up according to the browser and amount of data.
In this case the mode fSelectOrderItems(true) is not supported. When saving, the data are directly written in die subtable (also if this step is not sended!)
In this case you can switch to the subtable. This can be configured in the fields.xml.
Besides the fields of the fields.xml, the following fields are mandatory for the SQLTable: is_sql (text, 5 characters), DIFFERENCE (DECIMAL, 10 characters), ERROR_INFO (text, 50 characters).
The name of the subtable fields have to match the record subtableField in fields.xml.
