The required PC application does not exist

What causes this issue?

You selected a document of a type which your frontend cannot process.
The system accepts the following:
SAP types
They can be displayed via the Possible entries pushbutton.
PC document types provided you are working on a PC
Your register must contain a valid entry for their file extension.

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?

If you are not working on a PC, you cannot edit the document on your
frontend. However, you can save the document in a local file.
To do this, select <LS>Document -> Move -> Download</>.
The system will then write your document to a sequential file.
If you are working on a PC, you have two options:
You can download the document to a PC file via <LS>Document -> Move ->
Download</>.
If the desired type can be processed on your PC and it is only the
respective entry in your register which is missing or incorrect, you can
correct your register. However, you must then log onto the SAP System
again.

Error message extract from SAP system. Copyright SAP SE.