How to Entmod an entity if it has more dxf goup code with the same number

Hello everyone, just a little question..

I've to entmod an entity but it has a lot of parameters.

((-1 . <Nome entità: 7ff5ff013970>) (0 . "XRECORD")
                                   (5 . "57F")
                                   (102 . "{ACAD_REACTORS")
                                   (330 . <Nome entità: 7ff5ff00a2e0>)
                                   (102 . "}")
                                   (330 . <Nome entità: 7ff5ff00a2e0>)
                                   (100 . "AcDbXrecord")
                                   (280 . 1)
                                   (90 . 4)
                                   (90 . 7)
                                   (1 . "568")
                                   (1 . "")
                                   (290 . 0)
                                   (40 . 0.0)
                                   (290 . 0)
                                   (290 . 1)
                                   (290 . 0)
                                   (290 . 1)
                                   (290 . 0)
                                   (290 . 0)
                                   (290 . 0)
                                   (290 . 0)
                                   (290 . 1)
                                   (40 . 0.0)
                                   (70 . 9)
                                   (70 . 0)
                                   (70 . 4)
                                   (70 . 3)
                                   (70 . 3)
                                   (70 . 253)
                                   (70 . 1)
                                   (40 . 1.6)
                                   (40 . 1.6)
                                   (40 . 0.0)
                                   (40 . 1.0)
                                   (1 . "CB_Richiami")
                                   (1 . "ACA_1")
                                   (1 . "ACA_1")
                                   (1 . "")
                                   (1 . "")
                                   (1 . "")
                                   (40 . 1.0)
                                   (290 . 1)
                                   (40 . 0.899037)
                                   (40 . 100.0)
                                   (40 . 0.5)
                                   (40 . 1.0)
                                   (1 . "1")
                                   (1 . "")
                                   (1 . "")
                                   (1 . "")
                                   (1 . "")
                                   (40 . 1.0)
                                   (290 . 1)
                                   (290 . 1)
                                   (40 . 95.0)
                                   (40 . 20.0)
                                   (70 . 0)
                                   (40 . 0.0)
                                   (40 . 0.0)
                                   (40 . 0.0)
                                   (40 . 0.0)
                                   (40 . 0.0)
                                   (1 . "")
                                   (40 . 0.0)
                                   (40 . 0.0)
                                   (40 . 0.5)
                                   (40 . 1.25)
                                   (40 . 0.0)
                                   (40 . 0.0)
                                   (70 . -1)
                                   (70 . 1)
                                   (40 . 1.4)
                                   (1 . "ACA_1")
                                   (1 . "")
                                   (290 . 1)
                                   (70 . 1)
                                   (290 . 1)
                                   (290 . 0)
                                   (1 . "")
                                   (40 . 0.0)
                                   (40 . 0.0)
                                   (290 . 0)
                                   (70 . -1)
                                   (290 . 1)
                                   (1 . "{IdBlocchiEstreminta")
                                   (1 . "56A")
                                   (1 . "56B")
                                   (1 . "IdBlocchiEstreminta}")
                                   (1 . "{IdTxtEtichetta")
                                   (1 . "56C")
                                   (1 . "56E")
                                   (1 . "56D")
                                   (1 . "574")
                                   (1 . "573")
                                   (1 . "IdTxtEtichetta}")
                                   (1 . "{IdTxtCampiSerieBarre")
                                   (1 . "56C")
                                   (1 . "IdTxtCampiSerieBarre}")
                                   (1 . "{PuntiPolilinea")
                                   (1 . "PuntiPolilinea}")
                                   (1 . "569")
                                   (1 . "575")
                                   (70 . 1)
)

For example if i want to change the 4th dxf group (40 . x) what should I do?

(setq quota (subst (cons 40 0.5)(assoc 40 quota) quota))
(entmod quota)

my code works only with the 1st one..

Thanks

Dennis

Here's one possible way:

(setq cnt 0)
(entmod
   (mapcar
       (function
           (lambda ( itm )
               (if (and (= 40 (car itm)) (= 4 (setq cnt (1+ cnt))))
                  '(40 . 0.5)
                   itm
               )
           )
       )
       quota
   )
)

thank you Mr. Lee! you're the best

AFAIK you cannot 'entmod' an xrecord. See here.