Too many list levels (Please exit a list)

What causes this issue?

Each time the function you requested is invoked, a new list is created.
In the process, the previous list is stored in each case.
For technical reasons, no further list can now be created.

System Response

The function you wish to invoke cannot be performed.

How to fix this error?

Please close one of the previously created lists.

Error message extract from SAP system. Copyright SAP SE.