Error: "Not able to retrieve Display values for Service"

 Hi,

Few of our orders flash the below error message when the order is queried

 "Not able to retrieve Display values for Service"

Column service_reference_type_code has a value of "ORDER" at the line level.

If I make this value null or change it to CUSTOMER_PRODUCT, the error disappears.

Can someone explain the significance of this column value and what could have been causing this error message?

Thanks in advance,

JC