I have one requirement. 2 files are there. First file has the total length of 573 bytes and fixed Block. Keys are at the position for both the files are 139 position 9 bytes and another key 176 position 4 bytes. if the the record in the record file based on key matched with the first file record. i need to add an Indicator DM at the 572,573 position. Please anyone let me know how this is accomplished using JCL.