FreeSwan errors : ipsec4_rcv: incoming packet failed policy check; dropped

Hi,

after adding a second connection to my ipsec.conf i got these errors :

Aug 2 08:00:08 hostname kernel: ; found spi=0x7eaf6e51,
dst=xxx.xxx.xxx.xxx, proto=3/ESP

Aug 2 08:00:08 hostname kernel: ipsec4_rcv: incoming packet failed
policy check; dropped

The two connections are configured for the same remote subnet but offer
access to two different local subnets.

Example :

REMOTESUBNET = 192.168.1.0
LOCALSUBNET_1 = 192.168.100.0
LOCALSUBNET_2 = 192.168.70.0

Our customer from REMOTESUBNET is accessing services in both
LOCALSUBNETS and as it seems (customer did not report any problems)
everything is working, but i want to know what to do with those
errors...

Has anyone experienced such problems, too ? I cant find any information
on that error that helps me rate its severity.

mfg
Dennis B.