The "This expense is not associated with a card statement" policy issue message means you've attempted to submit one or more company card expenses that are not part of your company card statement import.
Imported company card expenses show a blue card icon to make it easy to tell at a glance which draft expenses have been imported to your My Expenses account.
When your company Finance team has enabled the 'company card expenses must be associated with a statement' policy rule, only company card expenses with the blue imported label can be submitted for approval.
If you have any manually created company card expenses, you can use the Merge feature to merge these with your incomplete imported company card expenses via either the web portal or mobile app.
Note: To view which statement an imported company card expense belongs to, you can use the 'Statement' Filter option when filtering your draft expenses in your My Expenses area.