Request parameters:
- long organisationId - organisation id
- long documentId - document id
- long documentAttachmentId - document attachment id
- DocumentAttachment documentAttachment - New documentAttachment data.
/// Document attachment details.    public class 
DocumentAttachment
    {
        // Document attachment id.        // Ignored on create request.         public long DocumentAttachmentId { get; set; }
        // Document.        public 
mMApiFkField Document { get; set; }
        // Attachment description.        public string Description { get; set; }
        // Attachment data.        public string AttachmentData { get; set; }
        // Attachment name for file.        public string FileName { get; set; }
        // Attachment mime type.        public string MimeType { get; set; }
        // Entry date.        public DateTime EntryDate { get; set; }
        public DateTime RecordDtModified { get; set; }
        // Row version is used for concurrency check.        // Ignored on create request.         public string RowVersion { get; set; }    
    }
        /// Link with id, name and url to related data.        public class 
mMApiFkField
        {
            // Record id.            public long? ID { get; set; }
            // Record name.            public string Name { get; private set; }
            // Url to full record details.            public string ResourceUrl { get; private set; }        
        }
Request parameters:
- Long organisationId - organisation id
- Long documentId - document id
- Long documentAttachmentId - document attachment id
- DocumentAttachment documentAttachment - New documentAttachment data.
/// Document attachment details.    public class 
DocumentAttachment
    {
        // Document attachment id.        // Ignored on create request.         public Long DocumentAttachmentId;
        // Document.        public 
mMApiFkField Document;
        // Attachment description.        public String Description;
        // Attachment data.        public String AttachmentData;
        // Attachment name for file.        public String FileName;
        // Attachment mime type.        public String MimeType;
        // Entry date.        public Date EntryDate;
        public Date RecordDtModified;
        // Row version is used for concurrency check.        // Ignored on create request.         public String RowVersion;    
    }
        /// Link with id, name and url to related data.        public class 
mMApiFkField
        {
            // Record id.            public Long ID;
            // Record name.            public String Name;
            // Url to full record details.            public String ResourceUrl;        
        }