E: Field value nodes must have dependent nodes

What causes this issue?

A field value node has no dependent node, or more than one dependent
node of an incorrect type.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Combination rules for field value nodes:
- The field value node must have a node child.
- The node child must not be a field value node.
- The field value node is allowed no more than one node child if the
node child is of a decision operation, error operation, or subfeature
access type.
- A field value node for a main feature is also allowed no more than
one node child if the node child is of a program access type.
- If a main feature has field return, a field value node is allowed no
more than one node child if the node child is of the return value
type.
- Two node children are allowed if a node child contains a debugging
operation.
- If a main feature has table return, a maximum of 36 node children
are allowed if all of the node children contain return lines, or a
maximum of 35 return lines and just one debugging operation.
- A subfeature is allowed a maximum of 36 node children if they all
contain return lines or program accesses, or 35 and just one
debugging operation.

Error message extract from SAP system. Copyright SAP SE.