Oracle Solution for Error ora-13227

ORA-13227: SDO_LEVEL values for the two index tables do not match

What triggered the Error:

The SDO_LEVEL values for the two index tables used in the spatial join operator do not match.

What should we do to fix it:

Verify that two compatible indexes are used for the spatial join operator. Quadtree indexes are compatible if they have the same SDO_LEVEL and SDO_NUMTILES values