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There might be confusion between the two 

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There might be confusion between the two 

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mixing up both accounting systems might cause companies to get mixed up with information and many other problems.

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The two companies will run into a problem for their accounting systems due to different currencies. They can't use the same accounting system because they may have different expenses and different formats based on their country.

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both companies are already accustomed to their own accounting systems so joining together might result in a clash between the two companies. 

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both companies are already accustomed to their own accounting systems so joining together might result in a clash between the two companies. 

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Different businesses may used different accounting systems meaning a struggle between who controls the regulation of income or even the struggle of one of the businesses adapting to the other's style.

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mixing up both accounting systems will cause an issue

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The problems that would exist would be to follow different policies and lead to disorganization.

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Combining the accounting systems of two businesses might be confusing and unorganized for the business.

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One issue could be confusion for the two business because if both of them are doing different kind of works then it could really be complicated to organize everything.

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Former competitors now working together may not easily cooperate with each other and may take time to decide on the structure they will work on.

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Financial information of both businesses may become disorganized and hard to distinguish the two businesses.

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Companies purchases can become disorganized and could pose problems for accountants if one branch of the company is significantly doing better than another

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you might mix up both businesses since both have combined accounting systems

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The companies could have used different accounting systems and not know which one to use once they merge.

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There can be issues in using the proper method as well as properly training the business staff the new method. Leading to issues.

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One business may not know which accounting system to follow. One business may not WANT to follow the other company's accounting system.

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Other businesses may have different systems or already a way to function the store in a organized manner. Changing the store may effect the outlook towards future customers