Concatenate Function not pick more than 255 characters

Dear All,

I am working on QR-Code and I have to pick details from a invoicei.e. PO no, PO item, Qty, I have to show all line items in one QR. After concatenate the data, the size of Variable is more than 400 characters.

means data shown in 2 line items for the variables.

When I pass the variable data to QR-CODE, it only pass first line of varaible data and skips 2 line. So my QR-code created is wrong. I want all 400 character pass to QR-Code.

Please help how to handle the requirement.

Regards

Vikas