Hi @Bayo 
I’ve found the below answer from a similar issue reported before.

“Fond that reported error occurs while updating inventory part in stock record.  Error occurs due to mismatch of location type for particular location, when it is compared with actual location type pulled based on that location no.” -G1096356

This can be fixed through a data repair. So Its better if you can log a support ticket to IFS Support, then they will investigate the issue further and give  a proper answer/ Solution