Hans-Jürgen, The TrnsysConstants and TrnsysFunctions routines are data modules and when they are compiled, they produce something called a *.mod file. The *.mod files are compiler and compiler version dependent so sometimes you have to delete them and force them to recompile. You are correct that the USE statement accesses information from a data module. Make sure that there is a path in the *.sln settings to point to where "include and use paths" should point... C:\Trnsys16_1\Compilers\Ivf10.1\Modules\Release C:\Trnsys16_1\Compilers\Ivf10.1\Modules\Debug Best, David On 6/21/2010 02:06, Bühler Hans-Jürgen wrote:
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