How To Fix SF339 - Choose a structure name that starts with "Y" or "Z"

SAP Error Message - Details

• Message type: E = Error

• Message class: SF - SAPfind: Message Texts

• Message number: 339

• Message text: Choose a structure name that starts with "Y" or "Z"

What causes this issue?

You tried to create a structure whose name falls into the area reserved
for SAP.

System Response

The structure was not created.

How to fix this error?

The names of customer structures must begin with the letter "Y" or "Z".
Please choose a name conforming to this convention.

Error message extract from SAP system. Copyright SAP SE.