Records with comma in flat file (SSIS 2008R2)

I am using flat file as a source to pull the record and store it in another flat file. All records are getting loaded except for the records where comma is there in a particular row

I am pulling one field "Volume" and converting it into Decimal in Derived Column

(DT_NUMERIC,12,0)Volume

Below is the sample record:

	40	May6	23Mar2016	.25	2,227	23Mar2016	0
	40.5	May6	23Mar2016	.42	39	23Mar2016	0
	40.5	May6	23Mar2016	.45	676	23Mar2016	0
	41	May6	23Mar2016	.23	245	23Mar2016	0
	41	May6	23Mar2016	.76	538	23Mar2016	0

Package is pulling every record except the first record where volume value is 2,227.

But when i remove comma from the record (2,227 to 2227) it pulls the record. Is there any reason that why it is not pulling the records with comma.