No tax data exists (yet)

What causes this issue?

You selected the function <LS>Extras</> --> <LS>Taxes</>. The system
has not calculated any tax data yet.

How to fix this error?

Continue processing until you can choose <LS>Document</> -->
<LS>Simulate</>. When the system simulates the transaction, the tax data
is displayed.

Error message extract from SAP system. Copyright SAP SE.