Message SAP XW138 - Please enter a valid data view name

Diagnosis
The following restrictions apply for data view names:
Customer-defined data views must begin with an alphabetical character(letter A - Z). Standard views delivered by SAP begin with a digit 0 -9.
Data views can only contain alphabetical characters A - Z, digits 0 -9, and the underscore '_' character.
Spaces within the name are not allowed.