Data element & for search help parameter & is not atomic

What causes this issue?

To define the type, you must assign a
<DS:TX.DDDOK_SHLP_PARAMETER>search help parameter</> a
<DS:TX.DDDOK_DTEL>data element</>. Only those data elements that
describe an atomic type are allowed. You assigned search help parameter
&V2& a data element that describes a reference type.

System Response

INCLUDE DDDOC_CANCEL OBJECT DOKU ID TX

How to fix this error?

Assign the search help parameter a suitable data element.
INCLUDE DDDOC_SHLP_HANDLE OBJECT DOKU ID TX

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.