[PROJ] 2D Helmert transformation after the map projection and PROJ won't use added transformation from the database

[Even Rouault]

Leon,
>
> First question:
>
> Is it possible to add a 2D Helmert transformation to the proj.db 
> database. I tried adding it to the helmert_transformation_table, but 
> proj.db didn’t let me choose a projected crs as source transformation.
>
Yes as designed currently it is limited to source and target CRS being 
geographic CRS
>
> I want to add a helmert transformation which uses ETRS89/GK25 as 
> source crs and transforms it into the finnish VVJ crs.
>
> My second question is:
>
> I tried adding the helmert transformation as a proj string to the 
> other_transformation table, but proj won’t use it. I also added an 
> entry into the usage table for the transformation.
>
> When I add a normal helmert transformation or a grid transformation, 
> proj has no problem using them after they are added, but not when I 
> add a transformation in other_transformation.
>
Show your SQL INSERT statements

Even

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