Background
This applies to oil and chemical tankers which may store slop water in cargo tanks.
In Telscope all tanks have a specific tank type and can only be used for the associated content. Hence, if a tank is configured as a, say, a "chem cargo" tank, it will be available as a cargo tank in the cargo record book, but not as a slop tank.
Solution
These used for several purposes must be duplicated in Telscope. So in this example, the same tank should be registered both as a "chem cargo" tank and as a slop tank. The tank should have the same name, but we suggest adding the content to the name for clarity.
Go to Settings → Tanks, to edit the tank configuration:
The tank will now appear as a slop tank in Telscope. Telscope users must assure that such duplicated tanks are used for only one purpose at a time. In this example: When using "CARGO TK 5 PS (SLOP)" for slop water the corresponding chem cargo tank "CARGO TK 5 PS" should be empty.