Account number on zoho

Account number on zoho

Hi, 

We have migrated our client list through to ZOHO, however, we are now looking manually entering our account numbers which are in the format of (123/S1) - however, ZOHO keeps giving us an error to input a valid account number.  We tried several variations, but it seems that it doesn't accept Alphanumeric numbers.   

Please let us know of a solutions this matter.   Our client account numbers are specific to our needs and we can't change them at this point.   Thank you 

Rasha 
AVID Intellectual Property