Validate KPP RU
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Checks the entered data for compliance with the KPP format (registration reason code) of the Russian Federation.
- [Input] In - starts block execution.
- [Output] Out - is activated when the block has finished executing.
- [Input] kpp (string) - the value to check for compliance with the format.
- [Output] is_valid (boolean) - if the value matches the format, it returns the value True, otherwise - False.