Creating one single TR3 Element with mesh in cgx

Hello,

i want to create one single TR3 Element with mesh,
but i got these error:

ERROR: surf:A001 with 3 edges uses at least one line:L001 with div <2, this is not permitted. surf not meshed.

i don’t want it make by hand, so is there a workaround for these issue?
thnx in advance for your help

wbr dichtstoff

# TR3-Element

PNT ! 0 0 0
PNT ! 0 5 0
PNT ! 5 0 0

LINE ! D001 D002 101
LINE ! D002 D003 101
LINE ! D003 D001 101

GSUR A001 + BLEND + L001 + L002 + L003

ELTY all TR3
MESH all

prnt se
plot e all
view elem