1G check with Superelement CMS in MSC Nastran v2018.2

[cookiemonster69]

Hi everyone, I'm a student trying to get familiar with Superelement creation and assembly in MSC Nastran v2018.2.

I created a dummy FEM of 2 ducts attached to a valve. The purpose is to make a comparison between the complete FEM and a version where the Valve acts as a DMIG model using Component Mode Synthesis (CMS) and subject it to different checks like Freefree, Fixfix, 1G, etc.

For the creation run I am using sol103, I am also using these commands on the Case Control section:
PARAM AUTOQSET YES
EXTSEOUT(STIF,MASS,ASMBULK,EXTBULK,EXTID=100,DMIGPCH)

And this command on the Bulk Data section:
ASET1 123456 6001 6002 $ 6001 and 6002 being my FEM's interface "external" grid points

This way, I obtain a .pch+.asm files to include on the assembly run. Since I am trying to do a 1G check, I am using a GRAV load on the residual+DMIG but when checking the .f06 file the OLOAD Resultant matrix comes empty (zeros) and this warning message appears:

*** USER WARNING MESSAGE 2070 (MTRXIN)
REQUESTED DMIG MATRIX KAAX IS UNDEFINED.
User Information:
A DMIG matrix was selected in the Case Control but was not present
in the Bulk Data.
*** USER WARNING MESSAGE 2070 (MTRXIN)
REQUESTED DMIG MATRIX MAAX IS UNDEFINED.
User Information:
A DMIG matrix was selected in the Case Control but was not present
in the Bulk Data.

This is how I'm importing the DMIG model onto the assembly run:
SOL 101
GEOMCHECK SUMMARY
CEND
K2GG=KAAX
M2GG=MAAX
TITLE = 1G VALVE DMIG
ECHO = NONE
EQUILIBRIUM=YES
WEIGHTCHECK = YES
MEFFMASS(ALL)
SPCFORCES=ALL
OLOAD=ALL
SUBCASE 1
SUBTITLE= 1G X-DIRECTION
SPC = 2
LOAD = 1
SUBCASE 2
SUBTITLE= 1G Y-DIRECTION
SPC = 2
LOAD = 2
SUBCASE 3
SUBTITLE= 1G Z-DIRECTION
SPC = 2
LOAD = 3
BEGIN BULK
PARAM POST -1
PARAM WTMASS .00259
PARAM AUTOSPC NO
PARAM GRDPNT 0
PARAM K6ROT 1.
PARAM COUPMASS 1
PARAM SNORM 20.0
PARAM PRTMAXIM YES
PLOTEL 70640 6002 6001 $ interface nodes
$=======2=======3=======4=======5=======6=======7=======8=======9=======
SPC 2 50000 123456 0. 50006 123456 0.
$
GRAV 1 0 386.1 1. 0. 0.
GRAV 2 0 386.1 0. 1. 0.
GRAV 3 0 386.1 0. 0. 1.
$
INCLUDE 'DUCTS.bdf'
INCLUDE 'MAT1_COORDS.bdf'
INCLUDE 'valve_dmig.asm'
INCLUDE 'valve_dmig.pch'
ENDDATA

Is there a reason why the run is not detecting the DMIG matrixes KAAX and MAAX?