... aus der designer-hilfe:
Variables with String data types cannot contain more than 2,048 characters. Concatenate multiple variables to handle larger amounts of text. For example, instead of trying to set the variable "Source" equal to a 3,400-character text block, set the variable "Source1" equal to the first 1,700-character text block and "Source2" to the second 1,700 characters. Concatenate the variables as follows: