Error loading master data - Data record 1 ('AB031005823') : Version 'AB031005823' is not valid

Problem
Created a flat file datasource for uploading master data.Data loaded fine upto PSA.Once the DTP which runs the transformation is scheduled, its ends up in error as below:

Solution
After refering to many links on sdn, i found that since the data is from an external file,the data will not be matching the SAP internal format. So it shud be followed that we mark "External" format option in the datasource ( in this case for Material ) and apply the conversion routine MATN1 as shown in the picture below:

Once the above changes are done, the load was successful.
Knowledge from SDN forums
Conversion takes place when converting the contents of a screen field from display format to SAP-internal format and vice versa and when outputting with the ABAP statement WRITE, depending on the data type of the field.
Check the info here:
http://help.sap.com/saphelp_nw04/helpdata/en/2b/e9a20d3347b340946c32331c96a64e/content.htm
http://help.sap.com/saphelp_nw04/helpdata/en/07/6de91f463a9b47b1fedb5be18699e7/content.htm
This fm ( MATN1) will add leading ZEROS to the material number because when u query on MAKT with MATNR as just 123 you wll not be getting any values, so u should use this conversion exit to add leading zeros.