You might look at this
http://www.tiwcorp.comI have two customers who have been running their shops on this. VFP Almost MRP. At TIW training classes they bemoan MRP for their interpretation.
The primary customer is
http://www.cpctexas.com. CPC mfgs night vision replacement consoles for aircraft + other aircraft lighting components (wing tip, cabin overhead lighting etc). They own a Job Shop mfg type company named Rheaco. Both companies are being run its own version of TIW software. They are very happy so far.
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What ben makes tracks for what wil be. Words in the air pirnt foot steps on the groun for us to put our feet in to.
Riddley Walker