7 ISA-95 Data Representation Model 
7.3 DataTypes
7.3.9 ISA95ReturnEnum
The ISA95ReturnEnum describes the possible return status from a Method call. The ISA95ReturnEnum is defined in Table 37.
Table 37 – ISA95ReturnEnum values
| Name | Value | Description |
|---|---|---|
| Undefined | 0 | Undefined value, should never be seen. |
| NoError | 1 | There were no errors in processing the method. |
| InvalidJobOrderID | 2 | The referenced job order ID is invalid or not known to the receiver. |
| UnableToAcceptJobOrder | 3 | The server is currently unable to accept job orders. |
| UnableToAcceptJobOrderCommand | 4 | The server is currently unable to accept job order commands for the specified job order. |
| UnableToReturnJobResponse | 5 | The server is unable to provide a Job Response for the specified Job Order. |