Hi everyone! are there any limits in contracts for writing to storage in c4?

I try to load this data, but when I code in contract deal_code
(int, slice, slice, cell, slice) load_data () inline {
var ds = get_data().begin_parse();
return (
ds~load_uint(64), ;; id
ds~load_msg_addr(), ;; owner_address
ds~load_msg_addr(), ;; history_keeper
ds~load_ref(), ;; deal_code
ds~load_msg_addr() ;; address of buyer
);
}


i am trying to load data from c4 but when i write more code in contract Deal I cannot do it