Can not use 'valid' signal for back pressure when modelprim subsystem using folding?

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we are using the DSP Builder Advanced Blockset. we use the ChannelIn 's valid signal for back pressure (connected to a latch_1L blcok)in modelprim subsystem , and when we

enable folding, the error message: "the ChannelIn 's valid can only be connected to ChannelOut's

same signal", Is this mean I can not implement the back pressure and folding at same time?

How to do ?

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"folding", "back pressure", "ChannelIn", "ChannelOut"?

Don't assume we know what you mean. Why not tell us more details and what actually you want to do in simple terms.