If you cannot find the Company which already exists in Prima using the Company Lookup, then the likelihood is that the Company has been Marked For Deletion.
- Go to the Company Lookup, select the Company Type > Marked For Deletion
- Click Search
You should then find the Company, and you can either reinstate the existing Company in Prima by marking the Company Record as a Customer again, or leave it Marked For Deletion and amend the Account Code with a '#' or '*' prefix.