Some Wells Fargo and Co. employees reportedly altered information improperly on documents related to certain business customers, adding another layer to the banking giant’s woes.Wells Fargo already has been heavily sanctioned by federal regulators over its problems, including a massive fake-accounts scandal that erupted in September 2016. The sanctions include having the bank’s asset growth capped while it works to improve its corporate governance.Employees in Wells Fargo’s wholesale unit — which is separate from its retail bank — added or altered information, including Social Security numbers, on certain documents without customers’ knowledge in 2017 and early this year, the Wall Street Journal reported Thursday, citing unidentified sources.The employees did so as the San Francisco-based bank was trying to meet a deadline to comply with one of the regulators’ consent orders, and to meet new disclosure requirements from another regulator, the report said.The bank learned about the behavior from its employees and, after investigating, reported the problem to one of its main federal regulators, the Office of the Comptroller of the Currency, the newspaper said.Wells Fargo issued a statement saying that the matter involved “documents used for internal purposes.