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Automatic Field Update

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Hi, I am having problems with the automatic field updates. I've made a dynamic block with a length parameter "LENGTE (mm)" and a stretch action. In this block I also made a Attribute "LENGTE" the value of this attribute is linked to the length of the parameter with a field. The system variable "FIELDEVAL" is 31, so when I save or plot, or ..., the value of the attribute will be updated to the exact length of the parameter. Now when I insert the block and stretch the parameter to a desired length and I save the drawing the attribute is updated and it has the same value as the parameter. But when I close the drawing and I open it again AutoCAD changes this value to ###. I tried the command "UPDATEFIELD" but the value doesn't come back. I have made a command string "c^c^_fieldeval;0;0;save;close" so that when i close the drawing AutoCAD sets the system variable FIELDEVAL to 0 then saves it and closes the drawing, so when I open the drawing again AutoCAD doesn't update the fields. That solved the problem. When I open the drawing again, I made a command to put the fieldeval back to the default value "31", so when I change the length parameter the attribute "LENGTE" will be updated again after a save or a plot. But then it goes wrong and AutoCAD changes the value back in ###. What is the reason that AutoCAD can't update that field, it works fine when the drawing stays open but when the drawing has been closed and I open it again it doesn't work anymore? Can somebody help...? I've attached the block to this post.

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