Actually this did happen, in 1924 I think. The Weinmar Government refused some payment or other. The French mobilized some regiments to occupy Geman industrial sites in the Rhineland to enfoorce payment. Politically it was a disaster. The British and Belgian governments dithered, and Italy along with the US provided no support.

The French Army had no 'professional' regiments available who might have been suitable for such a mission. They had to send conscript regiments, that were reinforced with called up reservists. Neither the teenaged conscripts or the reservists had any great ethusiasm for the mission. The Germans in the occupied area were completely uncooperative and the French officials responsible for enforcing the treaty obligations were stalled at every step by German factory managers and government offcials.

The communist, socialist, and every other German political party made the occupation into its own political theatre. Demonstrations and confrontations with the French soldiers were organized with increasing frequency. Socialist and Communist partys in other nations, including France declared soldarity with their exploited brother workers in Germany. Business men became nervous as financial arraigments with German banks and business became threatened. (Note the Great Depression started in the US in 1929 or 1930, but in Europe economic problems dated from the end of the brief post WWI boom in 1922-23.) The disruption of gGerman industry in the Ruhr begain scaring businessmen as contracts in neaby Holland, Belgium, Switzerland, and hundreds of other areas beyond were threatened. The French governemnt came under increasing pressure from industrial and bank leaders to 'Do Something'.

Things came to a head when the German factory workers began attacking French soldiers. Increasingly large crowds of workers had to be cleared from areas at bayonet point. The worse incident occured when a platoon of soldiers fled into a building they were susposed to secure. The factory workers opened a a steam valve scalding the soldiers, who then shot their way out killing & wounding several 'unarmed' factory employees.

The French government decided it had made its point and abandoned the effort withdrawing its soldiers and ceased effective enforcement of the Versallies treaty. Long before Hitler made a progaganda issue of renouncing the Versallies Treaty the actions of the Weinmar government and the political weakness of the Allied governments had made it a dead letter.

Had France & its allies attempted to enforce the treaty then the riots would have likely turned into a sad and bloody war between the ill armed Germans and the Allied occupation army. The disruption to German industry would have been financially catastrphic across Europe & the world. Europe was already well along into a economic depression and another war in Germany would have made thing far worse. More finacial failures, banks and factorys closing, more unemployed....