AIS pos appear under main boat icon

[Frogeater]

Got 2 com ports coming to opencpn. one from AIS transponder, another from VHF AIS.
I don' t want to remove the ais/vhs link as the antenna is receiving perfectly long distance AIS targets. AIS transponder is connected on a lower antenna.

on OPENCPN I can see my own AIS trace Under my boat icon.
unfortunatly, the CPA alarm is effective as a proximity alert is detected.


I understand that there is probably a protocol error in the VHF firmware, bur i cannot correct the problem on this Equipment. VHF is sending AIVDM instead of AIVDO for its proper identification.
Is there a way to filter my own mmsi in order to avoid my own ais position to be displayed?