001|start of customer|custInfo1|custInfo2|
002|customer detail|detail1|detail2|
003|start of invoice|invoice1|...|
004|invoice detail|invoice detail 1|invoice detail 2|
003.1|start of invoice|invoice1|...|
004.1|invoice detail|invoice detail 2|...|
002|start of customer|cust Info 2.1|cust Info 2.1|
002|customer detail|detail 1|detail 2|
003|start of invoice|invoice 1|invoice 2|
004|invoice detail|invoice detail 1|invoice detail 2|
003|start of invoice|invoice1|...|
004|invoice detail|invoiceDetail1|...|
