SAP ABAP Message Class SIPT Message Number 233 (Billing date can't be changed since it's relevant for digital signature)
Hierarchy
SAP_APPL (Software Component) Logistics and Accounting
   FI-LOC (Application Component) Localization
     ID-SIGN-PT (Package) Localization - Digital Signature Portugal
Attribute
Message class SIPT  
Short Description SIPT: Digital Signature Portugal    
Message Number 233  
Documentation status   3   The short text describes the object sufficiently
Authorization check Error Message      
Changed On 20130531   
Message Text
Billing date can't be changed since it's relevant for digital signature
History
Last changed on/by 20140121  SAP 
SAP Release Created in   606