Dear Rafael,
afaik you can not disable the automatic contrasts. However, you can add
a "contrast manager" module to your model creation/estimation batch.
There is an option "Delete existing contrasts" - if you answer "Yes"
there, it will remove the automatic contrasts before estimating your own
ones.
Volkmar
<https://www.jiscmail.ac.uk/cgi-bin/webadmin?A2=SPM;830cc48e.1009>
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