In the standard Magento checkout, the street and number are entered into one single field (on address_line_1)
On bpost side, the number and street are entered in two separate fields.
Therefore the logic described hereafter will be used for the recipient address on labels and return labels for shipping methods "bpost home delivery" and "bpost home delivery International".

Please note that bpost plugin can only work properly with standard Magento fields. If standard Magento fields have been customized (for ex : add number, bus field or remove address_line_2 field ), the compatibility will neither be insured nor supported.

This is an example of standard Magento fields:

IF address_line_2 is empty, the following matching will be used :

IF address_line_2 is filled, the following matching will be used :