bronregel;bron_contact_id;bron_bedrijf_id;klantcode;contactnaam
R1;C-001;B-001;0007;Testcontact A
R2;C-002;B-002;0012;Testcontact B
R3;C-001;B-001;0007;Testcontact A
R4;C-004;B-999;0041;Testcontact D
R5;C-003;B-002;0020;Testcontact C nieuw