log.debug({
            title: 'account line level',         //133
            details:vbdataArr[z].vbLineAccount
          })
          log.debug({
            title: 'amount line level',           //1.00
            details: vbdataArr[z].vbLineAmount
          })
          log.debug('line number',vbdataArr[z].vbLineLineNumber) //0

          vendorbillRec.setSublistValue({
            sublistId: "expense",
            fieldId: "account",
            line: vbdataArr[z].vbLineLineNumber,
            value:parseInt(vbdataArr[z].vbLineAccount),
          });
          
          log.debug({
            title: 'get account line level',           //133
            details: vendorbillRec.getSublistValue({
              sublistId: "expense",
              fieldId: "account",
              line: vbdataArr[z].vbLineLineNumber,
            })
          })

I am setting the value of account and checking if it is getting set but still there is the error I am setting the value still this error is occuring, I don't understand why.

The error says you’re also missing the Amount…

Yes got it