Oracle : Ошибка ORA-31495

"error in synchronous change table on \"%s\".\"%s\""
*Cause: There was an error originating from this synchronous change
table. One possible cause is that schema redefinition has
occurred on the source table and one or more columns in the
change table are now a different type than corresponding
source columns. Another possible cause is that there is a
problem accessing the synchronous change table.
*Action: Check further error messages in stack for more detail about
the cause. If there has been schema redefinition, drop and
recreate the synchronous change table.

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