@@ -413,7 +413,7 @@ function generate_io_function(_sys, inputss::Tuple, outputss::Tuple;
413413    #  now generate the actual functions
414414    formulas =  [eq. rhs for  eq in  eqs]
415415    if  ! isempty (formulas)
416-         _, f_ip =  build_function (formulas, states, inputss... , params, iv; cse= true , expression)
416+         _, f_ip =  build_function (formulas, states, inputss... , params, iv; cse= false , expression)
417417    else 
418418        f_ip =  nothing 
419419    end 
@@ -428,7 +428,7 @@ function generate_io_function(_sys, inputss::Tuple, outputss::Tuple;
428428    elseif  fftype isa  PureStateMap
429429        (states,)
430430    end 
431-     _, _g_ip =  build_function (gformulas, gformargs... ; cse= true , expression)
431+     _, _g_ip =  build_function (gformulas, gformargs... ; cse= false , expression)
432432    #  for more thatn 1 output wrap funktion
433433    g_ip =  if  length (outputss) ==  1 
434434        _g_ip
@@ -439,7 +439,7 @@ function generate_io_function(_sys, inputss::Tuple, outputss::Tuple;
439439    #  and the observed functions
440440    obsstates =  [eq. lhs for  eq in  obseqs]
441441    obsformulas =  [eq. rhs for  eq in  obseqs]
442-     _, obsf_ip =  build_function (obsformulas, states, inputss... , params, iv; cse= true , expression)
442+     _, obsf_ip =  build_function (obsformulas, states, inputss... , params, iv; cse= false , expression)
443443
444444    return  (;
445445        f= f_ip, g= g_ip,
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