my SIL started a new contract with he council and in the contract it says that she is on x spine of x grade salary. in the paragraph about increments in salary it says N/A. In the the letter of offer ( letter before the contract) it stated that increment would apply after 6 months of employment until final point in the grade is reached. so why does it say N/A in the contract? does it mean that she is on the highest spine?