What does it mean if there is only a Match Type 3 record in F43121?

I am trying to understand why I only have Match Type 3 records in F43121 for a specific PO.  According to doc 625514.1, this is not listed in the Type Records you would expect to find.  The reference is listed below.  In 3-way Match, can you enter an invoice before the receipt is entered, then match the posted invoice to the receipt later?

I have a PO in F4311 with 8 lines. 

In F43121, I have 8 lines with Match Type 3.  

In F0411, I have an invoice that was entered and later voided.

 
Doc ID 625514.1:
Match Type (MATC)

The match type field is the key to understanding the records in the Purchase Order Receiver (F43121) file.