Request parameters:
- long organisationId - organisation id
- long productGroupId - product group id
- ProductGroup productGroup - product group data
/// Product group details.    public class 
ProductGroup
    {
        // ProductGroup id.        // Ignored on create request.         public long ProductGroupId { get; set; }
        // ProductGroup code.        public string Code { get; set; }
        // ProductGroup name        public string Name { get; set; }
        // Usage:
        // <ul>
        //     <li>D – Yes,</li>
        //     <li>N – No.</li>
        // </ul>        public string Usage { get; set; }
        public DateTime RecordDtModified { get; set; }
        // Row version is used for concurrency check.        // Ignored on create request.         public string RowVersion { get; set; }    
    }
Request parameters:
- Long organisationId - organisation id
- Long productGroupId - product group id
- ProductGroup productGroup - product group data
/// Product group details.    public class 
ProductGroup
    {
        // ProductGroup id.        // Ignored on create request.         public Long ProductGroupId;
        // ProductGroup code.        public String Code;
        // ProductGroup name        public String Name;
        // Usage:
        // <ul>
        //     <li>D – Yes,</li>
        //     <li>N – No.</li>
        // </ul>        public String Usage;
        public Date RecordDtModified;
        // Row version is used for concurrency check.        // Ignored on create request.         public String RowVersion;    
    }