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In some cases you may need to change the Base Theme for a layer. This is sometime necessary when you get 'no snaps at this position' errors.
Unfortunately, Base Themes cannot be changed through the forms and you would have to do this manually. To achieve these you would need to follow these steps
select nth_theme_id from nm_themes_all where nth_theme_name='<asset_theme_name>'
Assuming its 1234, the next step is to get the theme id for the existing base themeselect nth_theme_id from nm_themes_all where nth_theme_name='ROUTE_NETWORK_TAB'
select nth_theme_id from nm_themes_all where nth_theme_name='ROUTE_NETWORK_TAB'
select nth_theme_id from nm_themes_all where nth_theme_name='ROUTE_NETWORK'
delete from nm_base_themes where nbth_theme_id=1234 -- this is the asset theme idand nbth_base_theme=2345 -- this is the route_network_tab theme id
delete from nm_base_themes where nbth_theme_id=1234 -- this is the asset theme id
insert into NM_BASE_THEMES (nbth_theme_id, nbth_theme_name)VALUES (1234, -- this is the asset theme id, 5678) -- this is the ROUTE_NETWORK theme id-- and then make sure you commit