If by invoice you mean the vendors invoice to you his customer, which in QB is your bill

maybe

check in company settings to see if you have reimbursed expenses (I do not have a UK version of QBO to look at)

If you do, in the US it is gear>settings>company settings>expenses>bills and […]

Resolution for 'company settingsexpenses issue: 'Is there a way of allocating specific invoices to specific jobs/ customers?' available: Yes.

The company settingsexpenses issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the company settingsexpenses issue yourself by looking for a resolution described in the article. If it is a complex company settingsexpenses issue or you are unable to solve the issue, you may contact us by clicking here or by using other company settingsexpenses support options.

For more information about resolving issues related to company settingsexpenses in Quickbooks/QBO or to get support for the issue 'Is there a way of allocating specific invoices to specific jobs/ customers?', click the link below: