Hard and fast standards would just re-incentivize gaming the system on the operations side. Accounting is very, very difficult. The best answers often include subjective decision making.
Consider; your project managers claim to be done with 80% of a project. You've billed and been paid for 50%. One lone ranger claims the project is only 30% done. At completion, the project will require a an expensive piece of hardware from you to launch. You have three of these pieces of hardware in stock; the first two you bought cost $50k. The last one cost $150k. The market value is $100k, and the customer will pay $100k at launch.
There is no one answer as to how to book this. You have three choices for the inventory booking (FIFO, LIFO, AVCO) -- the first one will at launch book you a net profit of $50k, the second a loss of $50k, and the last one a profit $17k or so. And, you may decide to book the expense of the hardware now, depending on the contract, so it might look like an expense until you actually launch.
If you are accrual basis, you have at least two ways to book your current revenue; 80% or 30%. Depending on your internal personnel costs, that may yield a profit or a loss. Of course, if some of the project time has been spent on things that could yield benefit to the company later, you may move some of it over to an R&D budget,...
The decisions go on. They are neither trivial nor are they unlinked from reality -- answering the questions like 'did we make money on this project?' and 'how much should we sell the hardware for?' are basic questions that yield 'it depends' type answers.
So, yes, people lie on balance sheets, all the time. But, truth is often hard to achieve for even a very solid financial officer and good management team.