When you create INTRASTAT declarations (selection reports RVEXST00 and RVIMST00), data from the documents is analyzed and written to the VEIAV file. With the "Add entries" function, you can add new entries whenever you need to report INTRASTAT-relevant movements which cannot be represented using SAP documents, for example.
You can call this function from the foreign trade menu by choosing:
Declarations --> Authorities --> EU --> INTRASTAT --> Add entries.