Core Viewpoint - The article discusses issues faced by investors during the transition of accounts due to the merger of Guotai Junan and Haitong Securities, specifically related to account functionality and trading capabilities [1] Group 1: Account Issues - An investor reported that their Guotai Junan account was unable to execute trades, with several sell orders being rejected as "invalid account" [1] - The problems arose during the planned transition of legal entities and customer accounts set to take place on September 12, which involves switching the legal entity of Haitong Securities to Guotai Haitong [1] Group 2: Resolution and Analysis - The investor later confirmed that the issue was resolved, indicating that the trading would return to normal the following day due to the T+1 settlement process with the China Securities Depository and Clearing Corporation [1] - Industry analysts suggest that the trading issues are likely linked to the unique account system at the China Securities Depository, which may have been affected by the merger [1]