This validation rule seems invalid.

with{tC_08.01.a, (c0020, c0030, c0040, c0050, c0060, c0070, c0080, c0090, c0101, c0102, c0103, c0104, c0105, c0106, c0107, c0110, c0140, c0150, c0160, c0170, c0171, c0172, c0173, c0180, c0190, c0200, c0210, c0250, c0255, c0256, c0257, c0260, c0270, c0280, c0290, c0300), default: 0, interval: true}: abs({r0010}) >= abs({r0015}) + abs({r0016})

For column c0250 this formula is not valid. r0015 and r0016 are different subsets of r0010 but not 'complete', other exposure not falling into the subsets may exist as well. This can determine the average maturity of r0010 so that the condition is not true.