Zoho Books - Breaking A Working App

Zoho Books - Breaking A Working App

We've been using Zoho for many years now. 
Across all apps, entering phone numbers in standard formats was enabled in all apps. 
These formats are:

xxx.yyy.zzzz
xxx-yyy-zzzz
(xxx) yyy-zzzz

and we were able also to add extension numbers in these formats:

x12345
,,12345 (where the " , " is a universal character for pause when dialing the number

For some unknown reason which I honestly can't really understand, the developers of Zoho Books decided to restrict the Phone Number field to numeric characters only

Although they do allow you to save different format, your system is filled with numerous alerts next to the numbers. 

Please remove this unreasonable restriction and allow the users to revert back to flexible formatting of phone numbers
 

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