Foreign income box on self-assessment

Hi, when filling in my self-assessment i get a red request to check when clicking on "no" to foreign income in Section 3 (taillor your return), along with this message "HMRC receives data from foreign jurisdictions and that data tells us about taxpayers who have income or assets outside the UK. Please make sure all the information you provide in this return is accurate." I am not aware of any foreign income so am a bit confused why this has appeared. Where can I go/who can I call to clarify what this means? Thanks

Hi 

If you are certain you have no foreign income to declare, save and continue and it will let you move on.

Thank you