All views and pages of the tab &1 were deleted

What causes this issue?

All <DS:DE.TA_SICHT>views</> and <DS:DE.TA_BLATT>pages</> of
<DS:DE.TA_KARTEI>tab</> &V1& have been deleted.

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?

Error message extract from SAP system. Copyright SAP SE.