Execution Message 37=DOT

Imported from previous forum

I am parsing execution messages expecting
the field 37=somenumber which represents the
orderID.
I get frequent messages where I get 37=DOT
instead.
For example:

BAD 8=FIX.3.0 9=144 35=8 49=TRIBECA 56=TM 34=1089 43=N 52=09:49:44 51=001110 37=DOT

GOOD 8=FIX.3.0 9=188 35=8 49=TRIBECA 56=TM 34=1088 43=N 52=09:49:44 51=001110 37=509496934

Can someone explain this?

thanks.