Mobius Connect for Sage 50 UK does not support multi-currency. To resolve this, the invoices in ConnectWise PSA have to be set to the default currency in Sage 50 UK.
Support for multi-currency can be added as a future feature. To put your name on the list of partners requesting that Mobius Connect support multi-currency for Sage 50 Integrations, please contact your ConnectWise Account Manager. ConnectWise commissions feature additions on to Mobius Connect products when there is enough demand. Thank you for your cooperation.