When dealing with large decimals an "Arithmetic overflow error converting numeric to data type numeric."-error may occur when an array is returned by the broker-layer.

In FP34 K2 has added the abilty to assign the Decimal Precision Value" on the SOAP- and Assembly-brokers. The issue and the fix is described here: https://help.k2.com/kb003127

The error may however occur in other brokers too and it would therefore make sense if the "Decimal Precision Value" could be assigned globally, so that you would not have to maintain and assign the value on individual service instances.

The issue can easily be reproduced by calling "Serialize Item To Array" on any Decimal-object (for instance created as part of a REST or SOAP integration) with the value 668712811195178.

This results in something like {"$type":"System.Decimal[], mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089","$values":[668712811195178.0]}

If that value is then passed to the "Deserialize Type Array"-method, the exception will occur.