EDI Context Properties

In my map of the ISA Loop (837 schema) I have

ISA*00*    *00*   *zz*1234567 *zz*7654321

where does the 1234567 and 7654321 come from and how do Ichange it.

Also each line of my 837 file needs to end with a tilde. Right now theres no character at all. Where do I specify the ~ as a delemiter for the destination.