如何翻译“知道要求事项，但是没有规定由谁、在什么时候实施。”

体会意思，这样翻译较好：
requirements given， but when and by whom to be executed not specified.

knowing requirement items but not deciding who and when to carry out it.

understand the requirement butdo not prescibe who and when to carry into execution

I knew, but did not specify who, when implemented