OGM issue
1 What is an OGM
OGM is a structured reference used with wire transfers and supported by all banks in Belgium in the form of: +++090/9337/55493+++
This reference is used by the hotels to process the bank payments automatically

2 Structure
If you strip the + and / from the example +++090/9337/55493+++ you get 090933755493

The first 10 digits are typically the invoice number 0909337554. This could be a combination of invoice number and financial journal, or any other combination, but the invoice number is commonly used and should work for most of the customers.
Of course if the invoice number gets reset each year, you could have the same reference for different transactions. To prevent this scenario you could put the current year in the first 2 digits and use the rest for the invoice number.

The last 2 digits form the control amount: this is the modulo 97 of the first 10 digits. So 0909337554 gets divided by 97 and the rest will be the last 2 digits: 93
There are 2 exceptions:
• if module 97 is zero, 97 is used
• if module 97 only consists of 1 digit, an extra 0 is padded to the left
 
3 Use in a PMS
• This OGM reference should be automatically created when an invoice/bill is created and stored in the database.
• This field should be at all times printed on the invoices (below example from winner😊)

• This field should be available for accounting interfaces for Mews in the connector api function Bills/getAll:
o either in the Bills section:

o or in AccountingItems section (type Payments):