Problems w. RFC_READ_TABLE and TABLE_ENTRIES_GET_VIA_RFC - 4.6c to 4.7

Hello,
i've used, although it's not recommended, RFC_READ_TABLE successfully with 4.6c to read various QM tables, like 'QALS', 'QAVE' etc.
Now the company migrated from 4.6c to 4.7 and my modules stopped working partially.
When trying to read 'QALS', the function now throws back the following error: "Message:Error in ASSIGN-statement in program SAPLSDTX". While some other tables work flawlessy (like 'QAVE'). I'm pretty sure it's something related to floating point fields or some unicode transition, though i don't know any solution yet.
I tried to use TABLE_ENTRIES_GET_VIA_RFC instead, but this function throws another quite strange error, after the call: "Message:The types of the Operators dbtab and itab are not convertable into each other". Again, only with some tables.
Can anyone point me into the correct direction? Any help is very appreciated. By the way: writing own FMs is NOT an option.
Regards
Julian

Resolved myself

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>
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