Select Request Records from a migration table into the import table I_Flatrate_Term. You can also use the Text File Loader of the Java Client but this way is better if you deal with massive data (100K+ records).
INSERT INTO public.i_request (ad_client_id, ad_org_id, created, createdby, datetrx, i_errormsg, i_isimported, i_request_id, isactive, processed, r_status_id, result, status, summary, updated, updatedby,
value, c_bpartner_id, requesttype, r_requesttype_id, r_request_id, datenextaction, documentno)
SELECT
1000000,
1000000,
now(),
100,
erfassungsdatum :: TIMESTAMP,
NULL,
'N',
nextval('i_request_seq'),
'Y',
'N',
1000000,
NULL,
NULL,
details,
now(),
100,
'G0001',
NULL,
vorgangsartneu,
NULL,
NULL,
nachfassdatum :: TIMESTAMP,
NULL
FROM migration_data.<yourtablename>