Company Settings -> Customer tab -> Additional Settings:
- “Show Customer PO# on Statement document” checkbox:
- was added to the “General Settings” block -> next to the “Send email with Payment Receipt automatically” checkbox;
- isn’t checked by default; 
- if the checkbox is checked:
-  In the Statements PDF is displayed “Customer PO#” from the Invoice edit form:
- in the Description column. 
 
- in the Description column.
 
-  In the Statements PDF is displayed “Customer PO#” from the Invoice edit form:
 
