Reference materials

Hi
When I try to add a cross section I get this error

Does anyone know and could help me what is wrong here?
Here I send the whole code in Teddy:

!+!Chapter Materials
+prog aqua urs:1
head materials

echo full full
norm dc EN ndc 199X-200X

stee no 1 type s es 210000 gam 78.5
stee no 2 type s es 205000 gam 78.5

end

!+!Chapter CrossSections
+prog aqua urs:2
head crossSections

echo full full
ctrl face neg

sect no 100 btyp cent
poly type opz mno 1
vert no y z
1 375 0
2 375 1300
poly type opz mno 0
vert no y z
1 345 30
2 345 1264

sect no 101 btyp cent
poly type opz mno 2
vert no y z
1 375 0
2 375 1300
poly type opz mno 0
vert no y z
1 350 30
2 350 1264
end

Hello Dawid,

the reference material for the cross section is defined in record SECT with the default definition 1. The steel material no. 1 is not used in the cross section 101. Please define in record SECT MNO 2:
sect no 101 btyp cent mno 2

With kind regards
Sabine Fahrendholz
Senoir Product Manager