How can serial number selection be enforced on a FIFO basis using the sales order Import queue
Importing sales orders using the Sales Order Import Queue and serial numbers are to be application automatically on a FIFO basis
Step-by-step guide
Add this tag to the XML under the <Line> tag for each relevant inventory item. Exporting the sales order XSD’s (Utilities menu) reveals the allowed values for that particular tag.
<SalesOrderSerialStockSelectionTypes>e_SalesOrderSerialStockSelectionFIFO</SalesOrderSerialStockSelectionTypes>