Relating Multiple tables with one-to-many & many-to-many relations

I'm trying to construct a database the relates a building info table with a
utility accounts table, utility provider table, utility type table, and
individual tables for each utility account the will hold monthly transaction
data. I've successfully related the building table and the utility account
table together, and have related the supplier table and utility type table as
well. I have not been able to properly connect the individual utility account
tables to either the "building" table or the "accounts" table.

I get a "too many indexes" error message.
Any help on this issue. Please
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Thanks, Hal