Difference between TKSOLL & TKDIVP

Hello Experts,

could you please tell me what is the difference between TKSOLL & TKDIVP ?!

Actually i know that TKSOLL is the partial period for planned working time in Calendar Days & TKDIVP is the partial period for the flat rate period working time in Calendar Days

but actually i don't understand the meaning !!

(when i tried TKSOLL in a PCR for an employee hired at second half pf April 2013, TKSOLL gave me a value of 8 days, while TKDIVP gave me 30) .. i thought that GKSOLL will give me 30 (as it is the whole period) but this didn't happen !! so, i think i don't understand the difference clearly

thanks in advance,

best regards.