Header and Detail Records
Header records and detail records have identifiers. For example, when you import vendors there is the header identifier (HVEND) and the detail identifier (DVEND).
When you import new Vendor ID header records (with or without detail records), any Vendor ID beginning with “D” will not import because the import process thinks it is a detail record, such as (DollarTree, A, Dollar Tree…). In this case, since there is no matching header, the record is not imported. In order to tell the import process there is no detail record, the first field in the record must be the applicable header identifier (HVEND, DollarTree, A, Dollar Tree…).