I am sorry, today I have found that this was my mistake.

I have string values from SQLFORM - and compute evaluates properly.

But I have different FORM for bulk insert of many records, where 
in form.process().accepted I have integer values:
compute in DAL is wrapper into try/except - and it fails for integer values.

It is a little misleading, that 
db.table.insert(string_basefield=integer_value) will not fail and record is 
created,
but compute function fails invisibly, so the computed_field remain None.

But it was completly my mistake.

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