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It seems like you have misunderstood how RDCH works. A RDCH-file don't have the first three lines of a raw data file, i.e. the first record in a RDCH file shall be the first bus record. You shall not read a raw data file including case identification data with activity RDCH.
An alternative is to read a raw data file with IC=1, which will add the data of the file to the working files. Make sure that the first line in the file starts with 1 and read the raw data file with READ (not with RDCH).