I have similar troubles as here:
https://groups.google.com/forum/?fromgroups#!searchin/web2py/smartgrid$20foreign$20key$20constraint$20failed%7Csort:relevance%7Cspell:false/web2py/klspqXpha4E/mCwQ6HC5IhAJ

I just have smartgrid, 1 parent table (main table for smartgrid), 1 child 
table. At the child foreign key I have standard requires=IS_IN_DB(db, 
db.parent.id)

In parent table I have just first record, child table is completly empty. 
Now I navigate through the link in smartgrid row (of the single parent 
record) and try add the first record into child table.
This fails with
foreign key constraint failed

Solution
adapter_args=dict(foreign_keys=False)
in DAL() works for me.

But, can I repair it better?

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