invoice should be created in text format

What is the actual problem that you are facing (except that you don't seem to have collected the business requirement details)?

With the detail provided here, I cannot suggest whether you need an output per billing document, output from some report, transaction authorizations, idocs, connections to SAP/non-SAP systems, transfers to ftp, data formats, encoding, conversions...

Nobody here in SCN could do the consulting part of the assignment for you, sorry.

Please discuss the requirement with your client, evaluate several possible options and when you face a specific problem, despite that you have searched for solutions in SCN, notes, external sites, and tested in your sandbox, you will have a higher chance to get better replies.

In some countries special tax software can be connected directly to SAP for this purpose (e.g. Vertex in the US).

Unless you are required to file taxes daily, I don't see any technical need to send the invoice information to the tax preparer for each transaction. You can simply create a report or query and then once or twice a month download it to a file and send it out. If you are OK with doing it manually then a query would be sufficient. If it's something more elaborate then you'd need an ABAP report.

Kindly do some research before posting on SCN and then ask more specific questions instead of just posting the requirements. If you need someone to provide a complete solution then there are websites where this can be done for a fee. Refer to this blog on how to ask better questions:

http://scn.sap.com/community/getting-started/blog/2010/05/12/asking-good-questions-in-the-forums-to-get-good-answers

Hi,

you can discuss with your abaper where the print programme will be developed in Text fomat

Moved from SAP ERP SD Sales to Output Management