sapCpiOutboundAddresses not capitalizing languageIsoCode

We discovered an issue in which SAP Commerce Cloud is replicating orders - via SCI - in which it is sending lowercase language iso code.

ECC iDoc is expecting to receive only a single upper case letter instead of the lowercase that commerce is posting.

Doing searches in the commerce code base, there is no upper case conversion being done.

Is this a miss on SAP parts? is this something that Commerce needs to customized to meet the requirements of SAP ECC?