Diagnosis
You have executed an additional operation while appending an element.

Example
The following container operation is not possible:
<- +

System Response
No further operations may take place while appending.

Procedure
To implement the required operation, an additional container operationmust be defined. This is inserted in the Workflow definition before thecontainer operation in which the appending takes place.

Example
1. Container operation: = +
2. Container operation: <-