I have dealt with before and one of the fixes is to truncate the DYNAMICS..syDeployedReports table.
Error message when running ClearCompanies script for Microsoft Dynamics GP: "Error: Conversion failed when converting the varchar value 'ABC' to data type int."
In this case ABC is a valid company and truncating the syDeployedReports does prevent this message. ABC only existed in the CompanyID field which not defined as int. What field is actually causing this message?