No text symbols exist

What causes this issue?

No text symbols have been defined in your document.

System Response

The list of text symbols cannot be displayed.

How to fix this error?

Unlike standard symbols, such as <(>&DATE&<)>, whose values are
automatically defined by SAPscript, text symbols must be defined by the
user. This is carried out with the <H>DEFINE</> command in the
SAPscript editor. The name of the text symbol can be freely defined.
Example: A text symbol is to be defined with the name <H>TEXTSYMBOL</>.
The following command line is used:
<H>/: DEFINE TEXTSYMBOL = 'Text symbol'</>
If the text symbol is now used in the text, SAPscript inserts the text
which has been defined for it when the text is output. The sentence
<H>This is a <(>&TEXTSYMBOL&<)>.</>
is output as
<H>This is a text symbol.</>
If text symbols are used in the text before their values have been
defined, they are not replaced in the text.

Error message extract from SAP system. Copyright SAP SE.