EDI for Scheduling Agreement

Hello experts,

I'm working on EDI for Scheduling Agreement. The scenario is buyer sends Schedule Lines (DELJIT and DELFOR) in EDI format. Then these EDI files needs to be imported into the Scheduling Agreement as schedule lines. Then according to the availability of the material, a Dispatch Advice needs to be sent to the buyer in the form of an EDI message.

Being a beginner to SAP EDI, i'm facing few problems. As of now, I do you have following concerns...

1. 1. The EDI files received from buyer are in string format. I'm not able to comprehend it. For format please find the attachment.

Should I directly import it into the SAP system? or Do I have to compulsory convert it into the IDOC format? If yes, do I compulsory need a convertor for it?

1. 2. In either case, please guide me, how should I proceed? I've been struggling with ALE/EDI for couple of months but still did not get any useful information.

Please, feel free to comment. All suggestions will be greatly appreciated.